#container {
	text-align: center;
	width: 750px;
	background-color: #CCC;
	margin-right: auto;
	margin-left: auto;
}


#kop {
	text-align: center;
	width: 750px;
	background-color: #CCC;
}
#knop1 {
	float: left;
	width: 187px;
	background-color: #CCC;
}
#knop2 {
	float: left;
	width: 187px;
	background-color: #CCC;
}
#knop3 {
	float: left;
	width: 187px;
	background-color: #CCC;
}
#knop4 {
	float: left;
	width: 187px;
	background-color: #CCC;
}
#midden {
	float: none;
	width: 750px;
}

#onder {
	background-color: #CCC;
	float: left;
	width: 750px;
}