<input type="text"/><input type="button" id="btn" value ="GO"/>
<br>
<ol>
<li>Normal (initial state --> grey)</li>
<li>Hover (move mouse over and hover --> light pink)</li>
<li>Active (click and hold mouse, drag out --> darker pink)</li>
<li>Focused (release mouse --> beige ...usually it would return to grey, but I made it beige for demonstration purposes)</li>
</ol>
<span>Note that hover or active states can happen simultaneously with focus state</span>