remove z-index for color-picker-hash div (#1711)

src/components/ColorPicker.scss

@@ -99,7 +99,6 @@
   display: flex;
   align-items: center;
   justify-content: center;
-  z-index: 1;
   position: relative;
 }
 .color-input-container:focus-within .color-picker-hash {