.quadrat_zahlenoperation
{
    FONT-SIZE: 15px;
    COLOR: #000000;
    FONT-FAMILY: Arial, Helvetica, sans-serif;
	font-weight: bold;
}

.button_zahlenoperation {
	color: #000000;
	font-size:15px;
	font-family: Arial, Helvetica, sans-serif;
	font-weight:bold;
	text-decoration: none;
	border:2px outset aqua;
	border-color: #CCCCCC;
	background-color:#B0B0B0;
	display: block;
	width:auto;
	height:auto;
	padding: 2px 2px;
	}