Make activeClass cleaner

Author: =

react/components/AutocompleteInput/SearchInput/index.tsx

@@ -70,25 +70,17 @@ const SearchInput: React.FC<PropTypes.InferProps<typeof propTypes> &
     onBlur && onBlur(e)
   }
 
-  let activeClass = classNames({
+  const regularSize = size !== 'small' && size !== 'large'
+  const activeClass = classNames({
     'b--muted-3': focused,
     'b--muted-4': !focused,
     'br--top': !roundedBottom,
-    'bg-disabled c-disabled': disabled,
-    'bg-base c-on-base': !disabled,
+    'bg-disabled': disabled,
+    'bg-base': !disabled,
+    [`h-${size}`]: !regularSize,
+    'h-regular': regularSize,
   })
 
-  switch (size) {
-    case 'small':
-      activeClass += ` h-${size}`
-      break
-    case 'large':
-      activeClass += ` h-${size}`
-      break
-    default:
-      activeClass += ' h-regular'
-  }
-
   const buttonClasses = classNames(
     activeClass,
     'bg-base br2 br--right w3 bw1 ba pa0 bl-0',