加些CSS，让网站变得面目全非，你会怎么做？

html {
  display: none !important;
}

html {
  visibility: hidden !important;
  background: #fff !important;
}

html:before {
  content: '' !important;
  position: fixed !important;
  z-index: 99999 !important;
  top: 0 !important;
  left: 0 !important;
  height: 100% !important;
  width: 100% !important;
  background: #fff !important;
  /*
  这么玩也很有意思
  background-image: url(随心所欲的图片);
  background-size: cover;
  */
}

html{
  transform: rotate(180deg) !important;
  transform-origin: 0 0 !important;
  background: #fff !important;
}

*:nth-child(3n) {
  color: yellow;
  background-color: red !important;
}
*:nth-child(3n+1) {
  color: blue;
  background-color: green !important;
}
*:nth-child(3n+2) {
  color: red;
  background-color: blue !important;
}

*:nth-child(odd) {
  position: absolute;
}

*:nth-child(odd) {
  font-size: 100px;
  letter-spacing: 2em;
  transform: skew(30deg);
}

html{
  transform: rotate(180deg) !important;
}

html{
  animation: 1s flash infinite !important;
}
@keyframes flash {
  0% { opacity: 0; }
  100% { opacity: 1; }
}