Display inline-block not working

.ex, .ex2, .ex3 {
    display: inline-block;
    vertical-align: top;
    margin: 0;
    padding: 0;
    height: 100%;  /* no need of height: 200px; here */
}                  /* if you need to extend it to parent height */
                   /* then use height: 100% */

Source: stackoverflow.com

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