Improve options page UI

Now the UI is a little bit more serious.

Fixed: translateselectedtext:12
Change-Id: If00acdd5a1148cb1223b959b4e32ab4029b3d09f
diff --git a/src/options/elements/options-editor/languages-editor.js b/src/options/elements/options-editor/languages-editor.js
index 7845a65..4265d50 100644
--- a/src/options/elements/options-editor/languages-editor.js
+++ b/src/options/elements/options-editor/languages-editor.js
@@ -20,7 +20,7 @@
           width: 300px;
           height: 250px;
           border: 1px solid #ccc;
-          background-color: #E3F2FD;
+          background-color: #fafafa;
           overflow: auto;
         }
 
@@ -36,7 +36,7 @@
           align-items: center;
           padding: 15px;
           border-bottom: 1px dashed #ddd;
-          background-color: #EEF7FD;
+          background-color: white;
           -webkit-user-select: none;
         }
 
diff --git a/src/options/options.js b/src/options/options.js
index cba1dd2..4ee6e35 100644
--- a/src/options/options.js
+++ b/src/options/options.js
@@ -36,14 +36,14 @@
           position: absolute;
           top: 0px;
           inset-inline-end: 50px;
-          background: rgb(195, 235, 204);
+          background: #e3f2fd;
           border: solid 1px rgb(139, 139, 139);
           border-top: 0;
           border-radius: 0px 0px 5px 5px;
         }
 
         #credits_container button#credits {
-          color: green!important;
+          color: #1f649d!important;
           margin: 0 5px;
           padding: 1px 3px;
           text-decoration: underline;
diff --git a/src/static/options.html b/src/static/options.html
index acb2157..376d756 100644
--- a/src/static/options.html
+++ b/src/static/options.html
@@ -9,7 +9,6 @@
         padding: 0;
         width: 470px;
         font-size: 90%;
-        background-color: #BBDEFB;
       }
     </style>
     <link href='http://fonts.googleapis.com/css?family=Roboto:400,700,700italic,400italic' rel='stylesheet' type='text/css'>