/*
 * Return the rem of a pixel's value
 *
 * Sample: pxToRem(50)
 * Result: 3.125rem
 */
/*
 * Return the percent ratio from width and height
 *
 * Sample: ratio(16, 9)
 * Result: 56.25%
 */
.overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1001; }