button { background-color : red }
input { background-color : red }
button:not(:enabled) { background-color : lime }
input:not(:enabled)  { background-color : lime }

<p>
 <button disabled="disabled">A button (disabled) with green background</button>
 <br>
 <input disabled="disabled" type="text" size="36" value="a text area (disabled) with green background">
</p>