add input colors

src/client/styles/scss/theme/default.scss

@@ -95,6 +95,7 @@ html[dark] {
   $color-link-nabvar: $color-global;
   $color-inline-code: #c7254e;
 
+  // Input colors
   $input-color: $color-global;
   $input-bg: $bgcolor-global;