用css3将input框写出类似Google登录页面的动画效果

效果一

代码如下

CSS

body{    background-color:#acacac;  }  .form-container{    display: block;    position: relative;    width: 400px;    height: 400px;    background: #fff;    margin: 50px auto;    padding: 30px;  }  input{    display: block;    position: relative;    background: none;    border: 2px solid #acacac;    border-radius:5px;    width: 100%;    font-weight: bold;    padding-left:10px;    font-size: 16px;    height:35px;    z-index: 1;  }  label{    display: inline-block;    position: relative;    top: -32px;    left: 10px;    color: #acacac;    font-size: 16px;    z-index: 2;    transition: all 0.2s ease-out;  }  input:focus, input:valid{    outline: none;    border: 2px solid #00aced;  }  input:focus + label, input:valid + label{    top: -50px;    font-size: 16px;    color: #00aced;    background-color:#fff;  }

HTML

<div class="main">    <div class="form-container">      <input type="text" name="input1" required>      <label for="input1">Account</label>      <input type="text" name="input2" required>      <label for="input2">Password</label>    </div>  </div>

效果二

代码如下：

CSS

body{    background-color:#acacac;  }  .form-container{    display: block;    position: relative;    width: 400px;    background: #fff;    margin: 50px auto;    padding: 60px;  }  input{    display: block;    position: relative;    background: none;    border: none;    border-bottom: 1px solid #ddd;    width: 100%;    font-weight: bold;    font-size: 16px;    z-index: 2;  }  label{    display: block;    position: relative;    top: -20px;    left: 0px;    color: #999;    font-size: 16px;    z-index: 1;    transition: all 0.3s ease-out;    margin-bottom:40px;  }  input:focus, input:valid{    outline: none;    border-bottom: 1px solid #00aced;  }  input:focus + label, input:valid + label{    top: -50px;    font-size: 16px;    color: #00aced;    background-color:#fff;  }

HTML

<div class="main">    <div class="form-container">      <input type="text" name="input1" required>      <label for="input1">Account</label>      <input type="text" name="input2" required>      <label for="input2">Password</label>    </div>  </div>

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