Fixed width div on left, fill remaining width div on right

Question

I want a div with a fixed width image on the left and a variable width div with a background color, which should extend its width 100% on my device. I can\'t stop the second div

Answer 1

Try removing the float:left and width:100% from .header-right — the right div then behaves as requested.

.header {
  float: left;
  background: #efefef;
  background-repeat: no-repeat;
  width: 240px;
  height: 100px;
}

.header-right {
  overflow: hidden; 
  background-color: #000;
  height: 100px;
}