Floated div, 100% height

Question

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Answer 1

Like this

demo

css

    .footer{
   display:table;
    width:100%;
}
.col1{
    background-color:red;
    display:table-cell;
}
.col2{
    background-color:red;
    display:table-cell;
    padding:0 10px;
}
.col3{
    background-color:red;
    display:table-cell;
}