css changes for clear browsing data page.

chrome/browser/resources/options/options_page.css

 body {
   cursor: default;
   font-size: 100%;
 }
 
 #settings-title {
   -webkit-padding-end: 24px;
   color: #53637d;
   cursor: pointer;
   font-size: 200%;
@@ skipping 14 matching lines @@
 }
 
 #search-field {
   margin: 0;
 }
 
 .overlay {
   position: fixed;
   left: 0;
   right: 0;
-  background: rgba(0, 0, 0, .2);
+  background: rgba(233, 238, 242, .5);
   top: 0;
   bottom: 0;
   z-index: 10;
   padding: 20px;
   display: -webkit-box;
   -webkit-box-align: center;
   -webkit-box-pack: center;
 }
 
 .raw-button,
@@ skipping 55 matching lines @@
 .button-strip {
   -webkit-box-orient: horizontal;
   display: -webkit-box;
 }
 
 html[toolkit=views] .button-strip {
   -webkit-box-direction: reverse;
 }
 
 .button-strip > button {
-  -webkit-margin-start: 4px;
+  -webkit-margin-start: 10px;
   display: block;
 }
 
 .overlay > div {
   -webkit-box-shadow: 3px 3px 3px #666;
   background: white;
   border-radius: 5px;
   padding: 15px;
   border: 1px solid #666;
   padding-bottom: 50px;
@@ skipping 507 matching lines @@
 }
 
 html[os=mac] label > input[type=checkbox],
 html[os=mac] label > input[type=radio] {
   margin-top: 2px;
 }
 
 .suboption {
   -webkit-margin-start: 16px;
 }