UI polish for certificate viewer

chrome/browser/resources/certificate_viewer.css

 /* Using 100% width within body should exclude margins. */
 body {
   bottom: 0;
   left: 0;
+  margin: 8px 0 0 0;
   position: absolute;
   right: 0;
   top: 0;
 }
 
 .title {
   display: inline-block;
   font-weight: bold;
   padding-bottom: 2px;
   padding-top: 15px;
@@ skipping 32 matching lines @@
 .attribute {
   display: table-cell;
   white-space: nowrap;
 }
 
 .value {
   display: table-cell;
   white-space: pre-wrap;
 }
 
-.controls {
-  text-align: end;
-}
-
 /* Used so that 100% width within tabpanel will correspond to usable space. */
 tabpanel {
   position: relative;
 }
 
 .vertical-box {
   -webkit-box-align: stretch;
   -webkit-box-orient: vertical;
   -webkit-box-pack: start;
   display: -webkit-box;
@@ skipping 12 matching lines @@
   top: 20%;
 }
 
 #cert-field-value-section {
   bottom: 0;
   height: 30%;
 }
 
 .section-contents {
   -webkit-box-flex: 1;
-  border: 1px solid black;
+  border: 1px solid #9e9e9e;
   /* Scrolling should be enabled on all tree views and value field. */
   overflow: auto;
 }
+
+#export {
+  -webkit-margin-start: 1px;
+  margin-bottom: 10px;
+  margin-top: 5px;
+}