Uprev Google Input Tools.

third_party/google_input_tools/src/chrome/os/inputview/emoji.css

 .inputview-emoji-switch-recent {
   background: url('images/recent.png') no-repeat center;
   background-size: 20px 20px;
   height: 20px;
   width: 20px;
 }
 .inputview-emoji-switch-hot {
   background: url('images/favorit.png') no-repeat center;
   background-size: 24.5px 24.5px;
   height: 24.5px;
@@ skipping 69 matching lines @@
   border-bottom-style:solid;
   border-bottom-color: #777777;
 }
 .inputview-emoji-key .inputview-special-key-bg {
   background-color: white;
 }
 .inputview-emoji-key .inputview-modifier {
   font-size: 30px;
   text-align: center;
 }
-.inputview-emoticon.inputview-emoji-key .inputview-modifier {
+.inputview-landscape .inputview-emoticon.inputview-emoji-key .inputview-modifier {
   font-size: 20px;
 }
+.inputview-portrait .inputview-emoticon.inputview-emoji-key .inputview-modifier {
+  font-size: 15px;
+}
 .inputview-emoji-back {
   margin: 1px;
   font-size: 18px;
   color: #111111;
   text-align: center;
 }
 .inputview-emoji .inputview-container {
   top: 20px;
 }
 .inputview-emoji-tabbar-sk {
@@ skipping 14 matching lines @@
   background-color: #ffffff;
   display: inline-block;
   height: 4px;
   position: absolute;
   overflow: hidden;
 }
 .inputview-indicator-background:hover {
   -webkit-transform: scaleY(2);
   transition: 0.1s all;
 }