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

with the use of css grid you can achieve this more easily

• you need to wrap those divs in a wrapper, lets say parent
• give .parent display: grid
• give grid-template-areas in .parent and grid-area in both children
• no need to use float: left in both children adjust the width of left div using grid-template-columns in .parent

.parent {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas: "header-left header-right";
}
.header {
    background-image: url(img/header.png);
    background-color: #ebebeb;
    background-repeat: no-repeat;
    height: 100px;
    grid-area: header-left;
}

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

css has become much more advanced and answering with the help of that advanced css just if it can be useful to someone :)