Zwei Div's nebeneinander - Float
HTML
<div><div id="eins"></div><div id="zwei"></div></div>CSS
#eins, #zwei {
display: block;
float: left;
width: 100px;
height: 100px;
}
#eins {
background: red;
}
#zwei {
background: yellow;
}
#holder:after {
content: ".";
display: block;
height: 0;
clear: both; /*Clearfix*/
visibility: hidden;
}