css动画实现炫酷的hover效果

0x00 前言

    今日在b站上看到一个hover动画效果，感觉写的非常好，所以复刻了一个

0x01 HTML+JS

  
  
  
  

  
  
  

  
  

  



  
  
    
    

      
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0x02 CSS

*{
  margin: 0;
  padding: 0;
}
body{
  /* 设置窗口的高度为100%的窗口高度 */
  height: 100vh;
  /* 伸缩盒子模型 */
  display: flex;
  /* 下面两个属性让body里的子类居中 */
  justify-content: center;
  align-items: center;
  background-color: #2c3e50;
}
.container{
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  width: 300px;
  height: 450px;
  border-radius: 20px;
  background-color: #34495e;
  box-shadow: 15px 15px 10px rgba(33,45,58,0.3);
  overflow: hidden;
  position: relative;
}
.container form{
  width: 300px;
  height: 200px;
  display: flex;
  justify-content: space-around;
  flex-direction: column;
  align-items: center;
  z-index: 1;
}
.container form .tbx{
  width: 200px;
  height: 40px;
  outline: none;
  border: none;
  border-bottom: 1px solid #fff;
  background:none;
  color: #fff;
}
/* 设置placeholder */
.container form .tbx::placeholder{
  color: #fff;
  font-size: 15px;
}
.container form .sub{
  width: 200px;
  height: 40px;
  outline: none;
  border: 1px solid #fff;
  border-radius: 20px;
  letter-spacing: 5px;
  color: #fff;
  background: none;
  cursor: pointer;
}
.container h1{
  z-index: 1;
  color: #ecf0f1;
  letter-spacing: 5px;
  padding-left: 5px;
  font-size: 50px;
  font-weight: 100;
  text-shadow: 5px 5px 5px rgba(33,45,58,0.3);
}
/* 设置鼠标进入的样式 */
.container .in{
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: #3498bd;
  transform: translate(-50%,-50%);
  /* 使用in动画，持续0.5s,缓出的时间函数，停留在最后一帧 */
  animation: in 0.5s ease-out forwards;
}
/* 设置鼠标离开的样式 */
.container .out{
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 1200px;
  height: 1200px;
  border-radius: 50%;
  background: #3498bd;
  transform: translate(-50%,-50%);
  animation: out 0.5s ease-out forwards;
}
/* 设置鼠标进入时，元素的动画 */
@keyframes in{
  /* 初始关键帧 */
  0%{
    width: 0;
    height: 0;
  }
  /* 结尾关键帧 */
  100%{
    width: 1200px;
    height: 1200px;
  }
}
/* 设置鼠标离开时，元素的动画 */
@keyframes out{
  /* 初始关键帧 */
  0%{
    width: 1200px;
    height: 1200px;
  }
  /* 结尾关键帧 */
  100%{
    width: 0;
    height: 0;
  }
}
.mouse-img {
  width:40px;
  height:40px;
  position: absolute;
}

0x03 效果