css flexbox: same height for all elements?

Question

Using CSS and flexbox, I don\'t understand how to give the same height to divs \"a\" and \"b\". I need b to become taller so as to match a\'s height. In other words, the gre

Answer 1

If you can survive without flex, positioning can do this.

#cont1{
}

#a{
    background-color:red;
    position: relative;
}

#b{
    background-color:grey;
    position: absolute;
    left: 0; top: 100%;
    width: 100%;
    height: 100%;
}

    

      
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