MD History: Tweak appearance of sign-in promotion

chrome/browser/resources/md_history/synced_device_manager.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_shared_menu/cr_shared_menu.html">
 <link rel="import" href="chrome://history/lazy_render.html">
 <link rel="import" href="chrome://history/shared_style.html">
 <link rel="import" href="chrome://history/synced_device_card.html">
 
 <dom-module id="history-synced-device-manager">
@@ skipping 22 matching lines @@
         align-items: center;
         display: flex;
         flex-direction: column;
         justify-content: center;
         overflow-x: hidden;
         text-align: center;
       }
 
       #sign-in-promo {
         color: var(--primary-text-color);
-        font-size: 28px;
+        font-size: 215%;
         margin-top: 40px;
       }
 
       #sign-in-promo-desc {
         color: #848484;
-        font-size: 16px;
+        font-size: 123%;
         margin-top: 10px;
       }
 
       #sign-in-button {
         background-color: var(--google-blue-500);
         color: white;
-        font-size: 14px;
+        font-weight: 500;
         margin-top: 24px;
+        padding-left: 12px;
+        padding-right: 12px;
       }
 
       #synced-device-list {
         padding-top: var(--first-card-padding-top);
       }
     </style>
     <div id="synced-device-list" hidden="[[!syncedDevices_.length]]">
       <template is="dom-repeat" items="[[syncedDevices_]]" as="syncedDevice">
         <history-synced-device-card device="[[syncedDevice.device]]"
             last-update-time="[[syncedDevice.lastUpdateTime]]"
@@ skipping 28 matching lines @@
         </paper-item>
         <paper-item id="menuDeleteButton" class="menu-item"
             on-tap="onDeleteSessionTap_">
           $i18n{deleteSession}
         </paper-item>
       </cr-shared-menu>
     </template>
   </template>
   <script src="chrome://history/synced_device_manager.js"></script>
 </dom-module>