@charset "UTF-8";
/* CSS Document */

* {
	margin: 0px;
}

html {
	margin: 0px;
	content-align: center;
}

.button_panel {
	border: solid black 5px;
	padding: 10px;
	width: 400px;
	height: 400px;
	display: table;
}

button {
	font-size: 6em;
	padding: 3px;
	display: table-cell
}