div.headbox {
  width: 100%;
}
div.headbox_side {
  box-sizing: border-box;
  width: 20%;
  float: left;
}
div.headbox_center {
  box-sizing: border-box;
  width: 60%;
  height: 220px;
  padding: 60px;
  float: left;
}

.nav{
	display: inline;
	float: left;
	margin: 55px 0 0 90px;
	position: relative;
	z-index: 1;
}

@media screen and (min-width: 1300px) {
	.kop_rijkeboer{
		text-align: center;
		letter-spacing: 4px;
		font-size: 35px;
		color: #d90812;
		font-weight: bold;
	}
	.interface {
	text-align: center;
	margin: 5px 0 0 0;
	font-family: Arial, Verdana, Geneva, Tahoma, Trebuchet MS, Arial, Sans-serif;
	letter-spacing: 3px;
	font-size: 1em;
    font-weight : bold;
	color: #000000;
 	}
}

.interface a { text-decoration:   none;}
.interface a:visited { text-decoration:   none;}
.interface a:hover { color: #d90812; text-decoration:   none;}
.interface_on {color: #d90812}

.emailbig{ text-align: center; font-size : 30px; color : #000; font-weight : bold;}
.emailbig a{ text-decoration:none; color : #000;}
.emailbig a:visited {text-decoration: none; color : #000;}
.emailbig a:hover { color: #d90812; text-decoration: none;}

.logo{
	background: url("https://www.rijkeboer.com/images/logo.png") repeat scroll 0 0 transparent;
	background-size: 150px Auto;
	float: left;
	width: 150px;
	height: 150px;
	margin: 9px 0 0 10px;
	position: relative;
	text-decoration: none;
	text-indent: -999em;
}