Have block level element fill 100% width of overflow-x: scroll container

Question

I\'ve got a container element that\'s a certain width, with overflow-x: auto. In it I have a block level header element (h1) that\'s supposed to, being a block

Answer 1

Try this:

css

#one {
    width: 200px;
    overflow: auto;
    border: solid 1px;
}

#one h1 {
    font-size 1.1em;
    background-color: blue;
    display: inline-block;
    width: 100%;
    margin-top: 0;
    position:relative;
}

table td {
    border: solid 1px;
    padding: 20px;
}

h1:after {
     content:"";
     background: blue;
     position: absolute;
     top: 0;
     bottom: 0;
     width: 100%;
    left:100%
 }

fiddle