html {
  /* 1 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  font-size: 16px;
  font-weight: normal;
  line-height: 1.5;
  /* 2 */
  -webkit-text-size-adjust: 100%;
  /* 3 */
  background: rgb(0, 0, 0);
  color: #666;
}