为网站增加雪花效果

  为网站添加 CSS 雪花
  将下面代码粘贴到需要显示雪花效果的页面，增加到<style>部分。

<style>
/* customizable snowflake styling */
.snowflake {
  color: #fff;
  font-size: 1em;
  font-family: Arial, sans-serif;
  text-shadow: 0 0 5px #000;
}

.snowflake,.snowflake .inner{animation-iteration-count:infinite;animation-play-state:running}@keyframes snowflakes-fall{0%{transform:translateY(0)}100%{transform:translateY(110vh)}}@keyframes snowflakes-shake{0%,100%{transform:translateX(0)}50%{transform:translateX(80px)}}.snowflake{position:fixed;top:-10%;z-index:9999;-webkit-user-select:none;user-select:none;cursor:default;animation-name:snowflakes-shake;animation-duration:3s;animation-timing-function:ease-in-out}.snowflake .inner{animation-duration:10s;animation-name:snowflakes-fall;animation-timing-function:linear}.snowflake:nth-of-type(0){left:1%;animation-delay:0s}.snowflake:nth-of-type(0) .inner{animation-delay:0s}.snowflake:first-of-type{left:10%;animation-delay:1s}.snowflake:first-of-type .inner,.snowflake:nth-of-type(8) .inner{animation-delay:1s}.snowflake:nth-of-type(2){left:20%;animation-delay:.5s}.snowflake:nth-of-type(2) .inner,.snowflake:nth-of-type(6) .inner{animation-delay:6s}.snowflake:nth-of-type(3){left:30%;animation-delay:2s}.snowflake:nth-of-type(11) .inner,.snowflake:nth-of-type(3) .inner{animation-delay:4s}.snowflake:nth-of-type(4){left:40%;animation-delay:2s}.snowflake:nth-of-type(10) .inner,.snowflake:nth-of-type(4) .inner{animation-delay:2s}.snowflake:nth-of-type(5){left:50%;animation-delay:3s}.snowflake:nth-of-type(5) .inner{animation-delay:8s}.snowflake:nth-of-type(6){left:60%;animation-delay:2s}.snowflake:nth-of-type(7){left:70%;animation-delay:1s}.snowflake:nth-of-type(7) .inner{animation-delay:2.5s}.snowflake:nth-of-type(8){left:80%;animation-delay:0s}.snowflake:nth-of-type(9){left:90%;animation-delay:1.5s}.snowflake:nth-of-type(9) .inner{animation-delay:3s}.snowflake:nth-of-type(10){left:25%;animation-delay:0s}.snowflake:nth-of-type(11){left:65%;animation-delay:2.5s}
</style>
<div class="snowflakes" aria-hidden="true">
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
  <div class="snowflake">
    <div class="inner">❅</div>
  </div>
</div>