display inline block not working

1.ex, .ex2, .ex3 {
2    display: inline-block;
3    vertical-align: top;
4    margin: 0;
5    padding: 0;
6    height: 100%;  /* no need of height: 200px; here */
7}                  /* if you need to extend it to parent height */
8                   /* then use height: 100% */
9