diff --git a/src/main/webapp/css/certificate.css b/src/main/webapp/css/certificate.css
new file mode 100644
index 0000000000000000000000000000000000000000..a45bd37e6f5843933b85877b0ca97d769236b6d4
--- /dev/null
+++ b/src/main/webapp/css/certificate.css
@@ -0,0 +1,835 @@
+* {
+ -webkit-box-sizing: border-box;
+ -moz-box-sizing: border-box;
+ box-sizing: border-box;
+}
+
+body {
+ color: #2e2d29;
+ font-family: 'Helvetica Neue', Helvetica, Arial, 'Source Sans Pro', sans-serif;
+ font-size: 16px;
+}
+
+a {
+ color: #6b0000;
+ text-decoration: underline;
+}
+
+a:hover {
+ text-decoration: none;
+ color: #820000;
+}
+
+p {
+ margin: 0 0 1em 0;
+ padding: 0;
+}
+
+h2,
+h3 {
+ font-weight: 400;
+ margin-bottom: 1em;
+}
+
+h2 {
+ font-size: 22px;
+}
+
+h3 {
+ font-size: 20px;
+}
+
+h2 strong,
+h3 strong {
+ font-weight: 700;
+}
+
+strong.success {
+ color: #009b76;
+}
+
+strong.error {
+ color: #8c1515;
+}
+
+.center {
+ text-align: center;
+}
+
+.btn {
+ text-decoration: none;
+}
+
+.box {
+ background-color: #f2f1eb;
+ border: none;
+ margin: 2em auto;
+ padding: 20px;
+ box-shadow: none;
+ width: 60%;
+ border: 1px solid #c4bfa9;
+ border-radius: 5px;
+}
+
+@media (max-width: 767px) {
+ .box {
+ width: 100%;
+ }
+}
+
+.box>h2,
+.box>h3 {
+ margin-top: 0;
+ text-align: center;
+}
+
+.box.box-error,
+.box.box-success {
+ min-height: 100px;
+}
+
+.box.box-error h2,
+.box.box-success h2 {
+ text-align: center;
+}
+
+.box.box-error {
+ border: 1px solid #8C1515;
+}
+
+.box.box-success {
+ border: 1px solid #009b76;
+}
+
+.box.box-error::before,
+.box.box-success::before {
+ position: static;
+ margin: 0 auto 20px auto;
+ display: block;
+ box-sizing: border-box;
+ text-align: center;
+ border-radius: 80px;
+ width: 1.12em;
+ font-weight: 800;
+ font-size: 50px;
+ line-height: 1em;
+ background: #fff;
+}
+
+.box.box-success::before {
+ content: "\02713";
+ color: #009b76;
+ border: 3px solid #009b76;
+}
+
+.box.box-error::before {
+ content: "\00021";
+ color: #8C1515;
+ border: 3px solid #820000;
+}
+
+.box.box-error:after,
+.box.box-success:after {
+ clear: both;
+ display: table;
+ content: " ";
+ box-sizing: border-box;
+}
+
+.action {
+ text-align: center;
+}
+
+p+.action {
+ margin: 2em 0 0 0;
+}
+
+.action>p:last-child {
+ margin-bottom: 0;
+}
+
+/* Bootstrap 4.1 button CSS */
+
+.btn {
+ display: inline-block;
+ font-weight: 400;
+ text-align: center;
+ white-space: nowrap;
+ vertical-align: middle;
+ -webkit-user-select: none;
+ -moz-user-select: none;
+ -ms-user-select: none;
+ user-select: none;
+ border: 1px solid transparent;
+ padding: 0.375rem 0.75rem;
+ font-size: 1rem;
+ line-height: 1.5;
+ border-radius: 0.25rem;
+ transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
+}
+
+@media screen and (prefers-reduced-motion: reduce) {
+ .btn {
+ transition: none;
+ }
+}
+
+.btn:hover,
+.btn:focus {
+ text-decoration: none;
+}
+
+.btn:focus,
+.btn.focus {
+ outline: 0;
+ box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
+}
+
+.btn.disabled,
+.btn:disabled {
+ opacity: 0.65;
+}
+
+.btn:not(:disabled):not(.disabled) {
+ cursor: pointer;
+}
+
+.btn:not(:disabled):not(.disabled):active,
+.btn:not(:disabled):not(.disabled).active {
+ background-image: none;
+}
+
+a.btn.disabled,
+fieldset:disabled a.btn {
+ pointer-events: none;
+}
+
+.btn-primary {
+ color: #fff;
+ background-color: #007bff;
+ border-color: #007bff;
+}
+
+.btn-primary:hover {
+ color: #fff;
+ background-color: #0069d9;
+ border-color: #0062cc;
+}
+
+.btn-primary:focus,
+.btn-primary.focus {
+ box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
+}
+
+.btn-primary.disabled,
+.btn-primary:disabled {
+ color: #fff;
+ background-color: #007bff;
+ border-color: #007bff;
+}
+
+.btn-primary:not(:disabled):not(.disabled):active,
+.btn-primary:not(:disabled):not(.disabled).active,
+.show>.btn-primary.dropdown-toggle {
+ color: #fff;
+ background-color: #0062cc;
+ border-color: #005cbf;
+}
+
+.btn-primary:not(:disabled):not(.disabled):active:focus,
+.btn-primary:not(:disabled):not(.disabled).active:focus,
+.show>.btn-primary.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
+}
+
+.btn-secondary {
+ color: #fff;
+ background-color: #6c757d;
+ border-color: #6c757d;
+}
+
+.btn-secondary:hover {
+ color: #fff;
+ background-color: #5a6268;
+ border-color: #545b62;
+}
+
+.btn-secondary:focus,
+.btn-secondary.focus {
+ box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.5);
+}
+
+.btn-secondary.disabled,
+.btn-secondary:disabled {
+ color: #fff;
+ background-color: #6c757d;
+ border-color: #6c757d;
+}
+
+.btn-secondary:not(:disabled):not(.disabled):active,
+.btn-secondary:not(:disabled):not(.disabled).active,
+.show>.btn-secondary.dropdown-toggle {
+ color: #fff;
+ background-color: #545b62;
+ border-color: #4e555b;
+}
+
+.btn-secondary:not(:disabled):not(.disabled):active:focus,
+.btn-secondary:not(:disabled):not(.disabled).active:focus,
+.show>.btn-secondary.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.5);
+}
+
+.btn-success {
+ color: #fff;
+ background-color: #28a745;
+ border-color: #28a745;
+}
+
+.btn-success:hover {
+ color: #fff;
+ background-color: #218838;
+ border-color: #1e7e34;
+}
+
+.btn-success:focus,
+.btn-success.focus {
+ box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.5);
+}
+
+.btn-success.disabled,
+.btn-success:disabled {
+ color: #fff;
+ background-color: #28a745;
+ border-color: #28a745;
+}
+
+.btn-success:not(:disabled):not(.disabled):active,
+.btn-success:not(:disabled):not(.disabled).active,
+.show>.btn-success.dropdown-toggle {
+ color: #fff;
+ background-color: #1e7e34;
+ border-color: #1c7430;
+}
+
+.btn-success:not(:disabled):not(.disabled):active:focus,
+.btn-success:not(:disabled):not(.disabled).active:focus,
+.show>.btn-success.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.5);
+}
+
+.btn-info {
+ color: #fff;
+ background-color: #17a2b8;
+ border-color: #17a2b8;
+}
+
+.btn-info:hover {
+ color: #fff;
+ background-color: #138496;
+ border-color: #117a8b;
+}
+
+.btn-info:focus,
+.btn-info.focus {
+ box-shadow: 0 0 0 0.2rem rgba(23, 162, 184, 0.5);
+}
+
+.btn-info.disabled,
+.btn-info:disabled {
+ color: #fff;
+ background-color: #17a2b8;
+ border-color: #17a2b8;
+}
+
+.btn-info:not(:disabled):not(.disabled):active,
+.btn-info:not(:disabled):not(.disabled).active,
+.show>.btn-info.dropdown-toggle {
+ color: #fff;
+ background-color: #117a8b;
+ border-color: #10707f;
+}
+
+.btn-info:not(:disabled):not(.disabled):active:focus,
+.btn-info:not(:disabled):not(.disabled).active:focus,
+.show>.btn-info.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(23, 162, 184, 0.5);
+}
+
+.btn-warning {
+ color: #212529;
+ background-color: #ffc107;
+ border-color: #ffc107;
+}
+
+.btn-warning:hover {
+ color: #212529;
+ background-color: #e0a800;
+ border-color: #d39e00;
+}
+
+.btn-warning:focus,
+.btn-warning.focus {
+ box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.5);
+}
+
+.btn-warning.disabled,
+.btn-warning:disabled {
+ color: #212529;
+ background-color: #ffc107;
+ border-color: #ffc107;
+}
+
+.btn-warning:not(:disabled):not(.disabled):active,
+.btn-warning:not(:disabled):not(.disabled).active,
+.show>.btn-warning.dropdown-toggle {
+ color: #212529;
+ background-color: #d39e00;
+ border-color: #c69500;
+}
+
+.btn-warning:not(:disabled):not(.disabled):active:focus,
+.btn-warning:not(:disabled):not(.disabled).active:focus,
+.show>.btn-warning.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.5);
+}
+
+.btn-danger {
+ color: #fff;
+ background-color: #dc3545;
+ border-color: #dc3545;
+}
+
+.btn-danger:hover {
+ color: #fff;
+ background-color: #c82333;
+ border-color: #bd2130;
+}
+
+.btn-danger:focus,
+.btn-danger.focus {
+ box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.5);
+}
+
+.btn-danger.disabled,
+.btn-danger:disabled {
+ color: #fff;
+ background-color: #dc3545;
+ border-color: #dc3545;
+}
+
+.btn-danger:not(:disabled):not(.disabled):active,
+.btn-danger:not(:disabled):not(.disabled).active,
+.show>.btn-danger.dropdown-toggle {
+ color: #fff;
+ background-color: #bd2130;
+ border-color: #b21f2d;
+}
+
+.btn-danger:not(:disabled):not(.disabled):active:focus,
+.btn-danger:not(:disabled):not(.disabled).active:focus,
+.show>.btn-danger.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.5);
+}
+
+.btn-light {
+ color: #212529;
+ background-color: #f8f9fa;
+ border-color: #f8f9fa;
+}
+
+.btn-light:hover {
+ color: #212529;
+ background-color: #e2e6ea;
+ border-color: #dae0e5;
+}
+
+.btn-light:focus,
+.btn-light.focus {
+ box-shadow: 0 0 0 0.2rem rgba(248, 249, 250, 0.5);
+}
+
+.btn-light.disabled,
+.btn-light:disabled {
+ color: #212529;
+ background-color: #f8f9fa;
+ border-color: #f8f9fa;
+}
+
+.btn-light:not(:disabled):not(.disabled):active,
+.btn-light:not(:disabled):not(.disabled).active,
+.show>.btn-light.dropdown-toggle {
+ color: #212529;
+ background-color: #dae0e5;
+ border-color: #d3d9df;
+}
+
+.btn-light:not(:disabled):not(.disabled):active:focus,
+.btn-light:not(:disabled):not(.disabled).active:focus,
+.show>.btn-light.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(248, 249, 250, 0.5);
+}
+
+.btn-dark {
+ color: #fff;
+ background-color: #343a40;
+ border-color: #343a40;
+}
+
+.btn-dark:hover {
+ color: #fff;
+ background-color: #23272b;
+ border-color: #1d2124;
+}
+
+.btn-dark:focus,
+.btn-dark.focus {
+ box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
+}
+
+.btn-dark.disabled,
+.btn-dark:disabled {
+ color: #fff;
+ background-color: #343a40;
+ border-color: #343a40;
+}
+
+.btn-dark:not(:disabled):not(.disabled):active,
+.btn-dark:not(:disabled):not(.disabled).active,
+.show>.btn-dark.dropdown-toggle {
+ color: #fff;
+ background-color: #1d2124;
+ border-color: #171a1d;
+}
+
+.btn-dark:not(:disabled):not(.disabled):active:focus,
+.btn-dark:not(:disabled):not(.disabled).active:focus,
+.show>.btn-dark.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
+}
+
+.btn-outline-primary {
+ color: #007bff;
+ background-color: transparent;
+ background-image: none;
+ border-color: #007bff;
+}
+
+.btn-outline-primary:hover {
+ color: #fff;
+ background-color: #007bff;
+ border-color: #007bff;
+}
+
+.btn-outline-primary:focus, .btn-outline-primary.focus {
+ box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
+}
+
+.btn-outline-primary.disabled, .btn-outline-primary:disabled {
+ color: #007bff;
+ background-color: transparent;
+}
+
+.btn-outline-primary:not(:disabled):not(.disabled):active, .btn-outline-primary:not(:disabled):not(.disabled).active,
+.show > .btn-outline-primary.dropdown-toggle {
+ color: #fff;
+ background-color: #007bff;
+ border-color: #007bff;
+}
+
+.btn-outline-primary:not(:disabled):not(.disabled):active:focus, .btn-outline-primary:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-primary.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
+}
+
+.btn-outline-secondary {
+ color: #6c757d;
+ background-color: transparent;
+ background-image: none;
+ border-color: #6c757d;
+}
+
+.btn-outline-secondary:hover {
+ color: #fff;
+ background-color: #6c757d;
+ border-color: #6c757d;
+}
+
+.btn-outline-secondary:focus, .btn-outline-secondary.focus {
+ box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.5);
+}
+
+.btn-outline-secondary.disabled, .btn-outline-secondary:disabled {
+ color: #6c757d;
+ background-color: transparent;
+}
+
+.btn-outline-secondary:not(:disabled):not(.disabled):active, .btn-outline-secondary:not(:disabled):not(.disabled).active,
+.show > .btn-outline-secondary.dropdown-toggle {
+ color: #fff;
+ background-color: #6c757d;
+ border-color: #6c757d;
+}
+
+.btn-outline-secondary:not(:disabled):not(.disabled):active:focus, .btn-outline-secondary:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-secondary.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.5);
+}
+
+.btn-outline-success {
+ color: #28a745;
+ background-color: transparent;
+ background-image: none;
+ border-color: #28a745;
+}
+
+.btn-outline-success:hover {
+ color: #fff;
+ background-color: #28a745;
+ border-color: #28a745;
+}
+
+.btn-outline-success:focus, .btn-outline-success.focus {
+ box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.5);
+}
+
+.btn-outline-success.disabled, .btn-outline-success:disabled {
+ color: #28a745;
+ background-color: transparent;
+}
+
+.btn-outline-success:not(:disabled):not(.disabled):active, .btn-outline-success:not(:disabled):not(.disabled).active,
+.show > .btn-outline-success.dropdown-toggle {
+ color: #fff;
+ background-color: #28a745;
+ border-color: #28a745;
+}
+
+.btn-outline-success:not(:disabled):not(.disabled):active:focus, .btn-outline-success:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-success.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.5);
+}
+
+.btn-outline-info {
+ color: #17a2b8;
+ background-color: transparent;
+ background-image: none;
+ border-color: #17a2b8;
+}
+
+.btn-outline-info:hover {
+ color: #fff;
+ background-color: #17a2b8;
+ border-color: #17a2b8;
+}
+
+.btn-outline-info:focus, .btn-outline-info.focus {
+ box-shadow: 0 0 0 0.2rem rgba(23, 162, 184, 0.5);
+}
+
+.btn-outline-info.disabled, .btn-outline-info:disabled {
+ color: #17a2b8;
+ background-color: transparent;
+}
+
+.btn-outline-info:not(:disabled):not(.disabled):active, .btn-outline-info:not(:disabled):not(.disabled).active,
+.show > .btn-outline-info.dropdown-toggle {
+ color: #fff;
+ background-color: #17a2b8;
+ border-color: #17a2b8;
+}
+
+.btn-outline-info:not(:disabled):not(.disabled):active:focus, .btn-outline-info:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-info.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(23, 162, 184, 0.5);
+}
+
+.btn-outline-warning {
+ color: #ffc107;
+ background-color: transparent;
+ background-image: none;
+ border-color: #ffc107;
+}
+
+.btn-outline-warning:hover {
+ color: #212529;
+ background-color: #ffc107;
+ border-color: #ffc107;
+}
+
+.btn-outline-warning:focus, .btn-outline-warning.focus {
+ box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.5);
+}
+
+.btn-outline-warning.disabled, .btn-outline-warning:disabled {
+ color: #ffc107;
+ background-color: transparent;
+}
+
+.btn-outline-warning:not(:disabled):not(.disabled):active, .btn-outline-warning:not(:disabled):not(.disabled).active,
+.show > .btn-outline-warning.dropdown-toggle {
+ color: #212529;
+ background-color: #ffc107;
+ border-color: #ffc107;
+}
+
+.btn-outline-warning:not(:disabled):not(.disabled):active:focus, .btn-outline-warning:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-warning.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.5);
+}
+
+.btn-outline-danger {
+ color: #dc3545;
+ background-color: transparent;
+ background-image: none;
+ border-color: #dc3545;
+}
+
+.btn-outline-danger:hover {
+ color: #fff;
+ background-color: #dc3545;
+ border-color: #dc3545;
+}
+
+.btn-outline-danger:focus, .btn-outline-danger.focus {
+ box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.5);
+}
+
+.btn-outline-danger.disabled, .btn-outline-danger:disabled {
+ color: #dc3545;
+ background-color: transparent;
+}
+
+.btn-outline-danger:not(:disabled):not(.disabled):active, .btn-outline-danger:not(:disabled):not(.disabled).active,
+.show > .btn-outline-danger.dropdown-toggle {
+ color: #fff;
+ background-color: #dc3545;
+ border-color: #dc3545;
+}
+
+.btn-outline-danger:not(:disabled):not(.disabled):active:focus, .btn-outline-danger:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-danger.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.5);
+}
+
+.btn-outline-light {
+ color: #f8f9fa;
+ background-color: transparent;
+ background-image: none;
+ border-color: #f8f9fa;
+}
+
+.btn-outline-light:hover {
+ color: #212529;
+ background-color: #f8f9fa;
+ border-color: #f8f9fa;
+}
+
+.btn-outline-light:focus, .btn-outline-light.focus {
+ box-shadow: 0 0 0 0.2rem rgba(248, 249, 250, 0.5);
+}
+
+.btn-outline-light.disabled, .btn-outline-light:disabled {
+ color: #f8f9fa;
+ background-color: transparent;
+}
+
+.btn-outline-light:not(:disabled):not(.disabled):active, .btn-outline-light:not(:disabled):not(.disabled).active,
+.show > .btn-outline-light.dropdown-toggle {
+ color: #212529;
+ background-color: #f8f9fa;
+ border-color: #f8f9fa;
+}
+
+.btn-outline-light:not(:disabled):not(.disabled):active:focus, .btn-outline-light:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-light.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(248, 249, 250, 0.5);
+}
+
+.btn-outline-dark {
+ color: #343a40;
+ background-color: transparent;
+ background-image: none;
+ border-color: #343a40;
+}
+
+.btn-outline-dark:hover {
+ color: #fff;
+ background-color: #343a40;
+ border-color: #343a40;
+}
+
+.btn-outline-dark:focus, .btn-outline-dark.focus {
+ box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
+}
+
+.btn-outline-dark.disabled, .btn-outline-dark:disabled {
+ color: #343a40;
+ background-color: transparent;
+}
+
+.btn-outline-dark:not(:disabled):not(.disabled):active, .btn-outline-dark:not(:disabled):not(.disabled).active,
+.show > .btn-outline-dark.dropdown-toggle {
+ color: #fff;
+ background-color: #343a40;
+ border-color: #343a40;
+}
+
+.btn-outline-dark:not(:disabled):not(.disabled):active:focus, .btn-outline-dark:not(:disabled):not(.disabled).active:focus,
+.show > .btn-outline-dark.dropdown-toggle:focus {
+ box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
+}
+
+.btn-link {
+ font-weight: 400;
+ color: #007bff;
+ background-color: transparent;
+}
+
+.btn-link:hover {
+ color: #0056b3;
+ text-decoration: underline;
+ background-color: transparent;
+ border-color: transparent;
+}
+
+.btn-link:focus, .btn-link.focus {
+ text-decoration: underline;
+ border-color: transparent;
+ box-shadow: none;
+}
+
+.btn-link:disabled, .btn-link.disabled {
+ color: #6c757d;
+ pointer-events: none;
+}
+
+.btn-lg, .btn-group-lg > .btn {
+ padding: 0.5rem 1rem;
+ font-size: 1.25rem;
+ line-height: 1.5;
+ border-radius: 0.3rem;
+}
+
+.btn-sm, .btn-group-sm > .btn {
+ padding: 0.25rem 0.5rem;
+ font-size: 0.875rem;
+ line-height: 1.5;
+ border-radius: 0.2rem;
+}
+
+.btn-block {
+ display: block;
+ width: 100%;
+}
+
+.btn-block + .btn-block {
+ margin-top: 0.5rem;
+}
+
+input[type="submit"].btn-block,
+input[type="reset"].btn-block,
+input[type="button"].btn-block {
+ width: 100%;
+}
+
diff --git a/src/main/webapp/x509.jsp b/src/main/webapp/x509.jsp
index 2ab48f3173c0c014acac0bb3a6daf5b3f99c1707..7a86a6fd1b5f7aea7be091ee058923771ec9d36d 100644
--- a/src/main/webapp/x509.jsp
+++ b/src/main/webapp/x509.jsp
@@ -36,7 +36,7 @@ if (max_age >= 0) {
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Client Certificate</title>
- <link href="/css/certificate.css" rel="stylesheet">
+ <link href="<%=request.getContextPath()%>/css/certificate.css" rel="stylesheet">
</head>
<body>