First run: tweaks to welcome page

chrome/browser/resources/welcome/welcome.css

 /* Copyright 2016 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 body {
   align-items: center;
   color: var(--paper-grey-900);
   display: flex;
   flex-direction: column;
   font-size: 100%;
@@ skipping 23 matching lines @@
 
 @keyframes fadeInAndSlideUp {
   from {
     opacity: 0;
     transform: translateY(8px);
   }
 }
 
 @keyframes spin {
   from {
-    transform: rotate(-1440deg) scale(0.8);
+    transform: rotate(1440deg) scale(0.8);
   }
 }
 
 @keyframes fadeInAndSlideDownShadow {
   from {
     opacity: .6;
     top: 0;
   }
 }
 
@@ skipping 113 matching lines @@
 
 .signin-buttons {
   align-items: center;
   display: flex;
   flex-direction: column;
   margin-top: 2em;
 }
 
 .action {
   background: var(--google-blue-500);
+  border-radius: 2px;
   color: white;
-  font-size: .875em;
+  font-size: .8125em;
   font-weight: 500;
-  line-height: 2.5em;
-  padding: 0.1em 1.5em;
+  line-height: 2.25rem;
+  padding: 0 1.5em;
 }
 
 .action:active {
   background: var(--google-blue-500);
 }
 
 .action:focus {
   background: var(--google-blue-700);
 }
 
 .link {
   color: var(--google-blue-700);
   display: inline-block;
-  font-size: .875em;
+  font-size: .8125em;
   margin: 1.5em;
   text-align: center;
   text-decoration: none;
 }
 
-.link:hover {
-  text-decoration: underline;
-}
-
 .watermark {
   -webkit-mask-image: url(chrome://welcome/watermark.svg);
   -webkit-mask-repeat: no-repeat;
   -webkit-mask-size: 100%;
   animation: fadeIn 1s cubic-bezier(0, 0, .2, 1) both;
   background: var(--paper-grey-400);
   bottom: 24px;
   height: 24px;
   position: absolute;
   width: 74px;
-}
+}
+
+@media(max-height: 608px) {
+  .watermark {
+    display: none;
+  }
+}