NNTP: Fix undo link color...

chrome/browser/resources/new_new_tab.css

 html {
   /* This is needed because of chrome://theme/css/new_tab.css */
   height: 100%;
 }
 
 body {
   margin: 0;
 }
 
 #main {
@@ skipping 329 matching lines @@
   text-overflow: ellipsis;
 }
 
 #notification.show {
   opacity: 1;
   pointer-events: all;
   -webkit-transition: opacity 1s;
 }
 
 #notification .link {
-  -webkit-margin-start: 20px;
+  -webkit-padding-start: 20px;
 }
 
 #notification > span > .blacklist-title {
   display: inline-block;
   max-width: 30ex;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
@@ skipping 395 matching lines @@
   #t3, #t7,
   html[dir='rtl'] #t0,
   html[dir='rtl'] #t4 {
     left: 534px;
   }
 
   #t4, #t5, #t6, #t7 {
     top: 147px;
   }
 }