.fullie {width: 100%;}	
.introzakelijk{margin: 0;  padding: 0; background-image: url("https://roella.nl/img/roel.webp");background-position: center bottom;background-repeat: no-repeat;background-size: 100%;}
.linkserd {box-sizing: border-box; padding: 0 40% 0 10%;}