diff --git a/light9/web/light9-color-picker.html b/light9/web/light9-color-picker.html
--- a/light9/web/light9-color-picker.html
+++ b/light9/web/light9-color-picker.html
@@ -54,6 +54,9 @@
          left: -50px;
          top: -110px;
      }
+     paper-slider {
+         width: 170px;
+     }
     </style>
     <div id="smallRainbowComp">
       <div id="smallRainbow" on-mouseenter="onEnterSmall"></div>