Add a sidebar to the DevTools Security panel.

Source/devtools/front_end/security/securityPanel.css

 /* Copyright (c) 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-.security.panel {
+.security-main-view {
     margin: 1em;
 }
 
-.security.panel .lock-icon,
-.security.panel .security-state {
+.lock-icon,
+.security-main-view .security-state {
     display: inline-block;
     margin: 0.2em;
     vertical-align: middle;
 }
 
-.security.panel .security-state {
+.security-main-view .security-state {
     font-weight: bold;
     font-size: 1.2em;
 }
 
-.security.panel .lock-icon {
+.lock-icon {
     width: 16px;
     height: 16px;
     border-radius: 2px;
     background-size: cover;
 }
 
-.security.panel .lock-icon-unknown {
+.lock-icon-unknown {
     background-image: url(Images/securityStateHttp.png);
 }
 
-.security.panel .lock-icon-http {
+.lock-icon-http {
     background-image: url(Images/securityStateHttp.png);
 }
 
-.security.panel .lock-icon-insecure {
+.lock-icon-insecure {
     background-image: url(Images/securityStateInsecure.png);
 }
 
-.security.panel .lock-icon-warning {
+.lock-icon-warning {
     background-image: url(Images/securityStateWarning.png);
 }
 
-.security.panel .lock-icon-secure {
+.lock-icon-secure {
     background-image: url(Images/securityStateSecure.png);
 }
 
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
-    .security.panel .lock-icon-unknown {
+    .lock-icon-unknown {
         background-image: url(Images/securityStateHttp_2x.png);
     }
 
-    .security.panel .lock-icon-http {
+    .lock-icon-http {
         background-image: url(Images/securityStateHttp_2x.png);
     }
 
-    .security.panel .lock-icon-insecure {
+    .lock-icon-insecure {
         background-image: url(Images/securityStateInsecure_2x.png);
     }
 
-    .security.panel .lock-icon-warning {
+    .lock-icon-warning {
         background-image: url(Images/securityStateWarning_2x.png);
     }
 
-    .security.panel .lock-icon-secure {
+    .lock-icon-secure {
         background-image: url(Images/securityStateSecure_2x.png);
     }
 }
 
-.security.panel .security-explanation {
+.security-explanation {
     margin: 16px 0px;
 }
 
-.security.panel .security-explanation .lock-icon {
+.security-explanation .lock-icon {
     display: inline-block;
     vertical-align: bottom;
 }
 
-.security.panel .security-explanation .explanation-title {
+.security-explanation .explanation-title {
     display: inline-block;
     font-weight: bold;
     font-size: 1.2em;
     margin-left: 4px;
 }
 
-.security.panel .security-explanation .explanation-text {
+.security-explanation .explanation-text {
     margin: 4px 0px;
 }