pixel to rem conversion

1html {
2  /* 62.5% of 16px base font size is 10px */
3  font-size: 62.5%;
4}
5
6/* Preserve 16px body font-size, set body font-size to 1.6rem */
7body {
8  /* 16px */
9  font-size: 1.6rem;
10}
11
12.some-element {
13  /* 10 * 1.2 = 12px */
14  font-size: 1.2rem;
15}