效果：
PixPin_2024-06-16_09-22-21.gif
HTML代码：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>CSS云雨效果</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="container">
      <div class="cloud"></div>
    </div>
    <script>
      function rain() {
        const cloud = document.querySelector(".cloud"),
          e = document.createElement("div"),
          left = Math.floor(Math.random() * 310),
          width = Math.random() * 5,
          height = Math.random() * 50,
          duration = Math.random() * 0.5;

        e.classList.add("drop");
        cloud.appendChild(e);
        e.style.left = left + "px";
        e.style.width = 0.5 + width + "px";
        e.style.height = 0.5 + height + "px";
        e.style.animationDuration = 1 + duration + "s";
        setTimeout(() => {
          cloud.removeChild(e);
        }, 2000);
      }

      setInterval(() => {
        rain();
      }, 20);
    </script>
  </body>
</html>

CSS代码：

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #1b1b1b;
}

.container {
  position: relative;
  width: 100%;
  height: 400px;
  display: flex;
  justify-content: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.container .cloud {
  position: relative;
  width: 320px;
  height: 100px;
  background-color: #fff;
  border-radius: 100px;
  filter: drop-shadow(8px 8px 0 #0005);
  animation: animateCloud 2s steps(1) infinite;
}

@keyframes animateCloud {
  0% {
    filter: drop-shadow(8px 8px 0 #0001) drop-shadow(0 0 0 #fff) brightness(1);
  }
  95% {
    filter: drop-shadow(8px 8px 0 #0001) drop-shadow(0 0 50px #fff5)
      brightness(10);
  }
}

.container .cloud::before {
  content: "";
  position: absolute;
  top: -50px;
  left: 40px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background-color: #484f59;
  box-shadow: 90px -10px 0 30px #484f59;
}

.container .cloud::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: #484f59;
  border-radius: 100px;
  z-index: 1000;
}

.container .cloud .drop {
  position: absolute;
  top: 40px;
  background-color: #05a2eb;
  width: 2px;
  height: 10px;
  transform-origin: bottom;
  animation: animate 2s linear infinite;
}

@keyframes animate {
  0% {
    transform: translateY(0) scaleY(1);
  }
  70% {
    transform: translateY(360px) scaleY(1);
  }
  80% {
    transform: translateY(360px) scaleY(0.2);
  }
  100% {
    transform: translateY(360px) scaleY(0) scaleX(15);
  }
}

标签: css, HTML

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