[MD settings] layout of site settings sub-pages

chrome/browser/resources/settings/settings_shared_css.html

 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style>
       :root {
         --checkbox-margin-start: 2px;
         --checkbox-size: 16px;
         --checkbox-spacing: 18px;
         --iron-icon-fill-color: var(--paper-grey-600);
         --iron-icon-height: 20px;
@@ skipping 158 matching lines @@
       .list-item.selected {
         font-weight: 500;
       }
 
       .list-item select {
         -webkit-margin-start: 4px;
       }
 
       .list-item > .middle {
         flex: 1;
-        margin: 8px 12px;
+        margin: 8px 16px;
         overflow: hidden;
         white-space: nowrap;
       }
 
       .list-item > .start {
         flex: 1;
         overflow: hidden;
         white-space: nowrap;
       }
 
@@ skipping 74 matching lines @@
             var(--checkbox-size) +
             var(--checkbox-spacing));
       }
 
       /* Keep the slider color consistent throughout the range. */
       paper-slider.always-on {
         --paper-slider-knob-start-border-color: var(--google-blue-700);
         --paper-slider-knob-start-color: var(--google-blue-700);
         --paper-slider-pin-start-color: var(--google-blue-700);
       }
+
+      .favicon-image {
+        background-repeat: no-repeat;
+        background-size: contain;
+        height: 16px;
+        width: 16px;
+      }
     </style>
   </template>
 </dom-module>