Background not showing behind floating divs [duplicate]

Answer 1

Add this to your stylesheet:

.group:before,
.group:after {
  content:"";
  display:table;
}
.group:after {
  clear:both;
}
.group {
  zoom:1; /* For IE 6/7 (trigger hasLayout) */
}

And add the class "group" to your "right_b" element, this will fix the collapsing div:

  
 
     
text 1
     
text 2