How to make div occupy remaining height?

Question

I have this problem, I have two divs:

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Answer 1

Use absolute positioning:

#div1{
    width: 100%;
    height: 50px;
    background-color:red;/*Development Only*/
}
#div2{
    width: 100%;
    position: absolute;
    top: 50px;
    bottom: 0;
    background-color:blue;/*Development Only*/
}