.challenge-box1 {
	display: inline-block;
	width: 320px;
	border: 1px solid black;
	margin: 10px;
	padding-top: 6px;
	font-size: 14px;
	background-color: white;
	vertical-align: top;
}

.challenge-box2 {
    display: inline-block;
    width: 320px;
    border: 1px solid black;
    margin: 10px;
	 padding: 6px;
	 font-size: 14px;
	 background-color: white;
	 vertical-align: top;  
}
.challenge-box3 {
    display: inline-block;
    width: 320px;
    border: 1px solid black;
    margin: 10px;
	 padding: 6px;
	 font-size: 14px;
	 background-color: white;
	 vertical-align: top;  
}
#challenge-grafik  {
	display:inline-block;
	text-align: center; 
	width: 318px; 
	border: 1px solid black; 
	font-size: 15px; 
	padding: 0px; 
	margin-top: 5px;
	background-color: #99CCFF;
	vertical-align: top;
}