Display a banner above each panel that contains managed options....

chrome/browser/resources/options/options_page.css

 body {
   font-size: 100%;
   -webkit-user-select: none;
 }
 
 #settings-title {
   -webkit-padding-end: 24px;
   padding-top: 1em;
   padding-bottom: 1em;
   text-align: end;
@@ skipping 66 matching lines @@
               -webkit-gradient(linear,
                                left top,
                                right top,
                                from(#eaeef3),
                                color-stop(0.97, #eaeef3),
                                to(#d3d7db));
   -webkit-border-end: 1px solid #c6c9ce;
   cursor: pointer;
   position: relative;
   width: 250px;
+  z-index: 2;
 }
 
 html[dir='rtl'] #navbar-container {
   background: -webkit-gradient(linear,
                                left top,
                                left bottom,
                                from(rgba(255, 255, 255, 0)),
                                color-stop(0.7, rgba(255, 255, 255, 0)),
                                to(white)),
               -webkit-gradient(linear,
@@ skipping 38 matching lines @@
                                from(white),
                                to(#d6def3));
 }
 
 .navbar-item-normal {
   background-color: #dfdfdf;
 }
 
 #mainview {
   -webkit-box-align: stretch;
-  width: 600px;
-  padding: 0 24px 24px;
-  position: relative;
+  padding: 0 0 0 251px;
+  margin: 0;
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: 0;
+  bottom: 0;
+  z-index: 1;
+}
+
+#mainview-content {
+  width: 550px;
+  padding: 0 24px;
+}
+
+#managed-prefs-banner {
+  background: -webkit-gradient(linear,
+                               left top,
+                               left bottom,
+                               from(#fff2b7),
+                               color-stop(0.97, #fae691),
+                               to(#878787));
+  height: 31px;
+  width: 100%;
+}
+
+#managed-prefs-banner, span {
+  margin: 0;
+  padding: 0;
+  vertical-align: middle;
+}
+
+#managed-prefs-icon {
+  background-image: url("chrome://theme/IDR_WARNING");
+  background-repeat: no-repeat;
+  background-position:center;
+  padding: 5px;
+  width: 24px;
+  height: 21px;
+  display: inline-block;
 }
 
 .page > h1 {
   -webkit-padding-end: 24px;
   padding-top: 1em;
   padding-bottom: 1em;
   border-bottom: 1px solid #eeeeee;
   -webkit-padding-start: 0;
   font-size: 125%;
   color: #54637f;
@@ skipping 84 matching lines @@
   -webkit-box-flex: 1;
 }
 
 .left-side-table > :last-child {
   -webkit-padding-start: 20px;
 }
 
 .left-side-table > :last-child button {
   width: 100%;
 }