bomberstudent/BSWFX/file/menu.html

<style type="text/css">
	button{
		width: 100%;
		height: 33%;
		color: black;
	}

	#select{
		border: 5px blue solid;
	}
</style> 

<button disabled>A</button>
<button id="select" disabled>B</button>
<button disabled>C</button>