div垂直居中

转自:https://www.cnblogs.com/mihoutaoguniang/p/6124299.html

小果今天要实现这样的效果:单纯css样式,实现body下子集的水平垂直居中。

body内容:

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<body>
    <div class="div1">
        <div class="div2"></div>
    </div>
</body>

效果:

通过一系列的尝试,实现了四种方法,惊奇的发现,其中三个是用position:absolute实现的:(div大小确定)

1.原理:position: absolute;top: 50%;left: 50%;margin-top: -50px;margin-left: -50px;

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<style type="text/css">
  html,body{
    height:100%;
    width:100%;
    backgroundblack;
    }
  .div1{
    height100px;
    width100px;
    positionabsolute;
    top50%;
    left50%;
    margin-top-50px;
    margin-left-50px;
    background: pink;
    }
  .div2{
    height10px;
    width10px;
    margin-top90px;
    background: lightblue;
    }
</style>

2.原理:margin: auto;position: absolute;top: 0;right:0;bottom: 0;left: 0;

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<style type="text/css">
  html,body{
    height:100%;
    width:100%;
    backgroundblack;
    }
  .div1{
    height100px;
    width100px;
    marginauto;
    positionabsolute;
    top0;
    right:0;
    bottom0;
    left0;
    background: pink;
    }
  .div2{
    height10px;
    width10px;
    margin-top90px;
    background: lightblue;
    }
</style>

3.原理:transform:translate(-100px,-100px);position: absolute;top: 50%;left: 50%;

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<style type="text/css">
  html,body{
    height:100%;
    width:100%;
    backgroundblack;
    }
  .div1{
    height100px;
    width100px;
    marginauto;
    positionabsolute;
    top50%;
    left50%;
    background: pink;
    -webkit-transform:translate(-100px,-100px);
    transform:translate(-100px,-100px);
    }
  .div2{
    height10px;
    width10px;
    margin-top90%;
    background: lightblue;
    }
</style>

4.原理:display:flex;justify-content:center;align-items:center;

body是这样子的:

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<body>
    <div class="div1"></div>
    <div class="div2"></div>
</body>

css:

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<style type="text/css">
  html,body{
    height:100%;
    width:100%;
    backgroundblack;
    display: flex;
    justify-contentcenter;
    align-items: center;
    }
  .div1{
    height100px;
    width100px;
    background: pink;  
    }
  .div2{
    height10px;
    width10px;
    positionabsolute;
    left50%;
    top50%;
    margin-top40px;
    margin-left-50px;
    background: lightblue;
    }
</style>

以上是div1的大小确定的居中方法,那如果大小不知道呢?小果使用了paddingO(∩_∩)O

代码君:(display: table-cell必不可少啊)

 body内容:

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<body>
    <div class="div1">
        <div class="div2"></div>
    </div>
</body>

css内容:

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<style type="text/css">
  html,body{
    height:100%;
    width:100%;
    backgroundblack;
    }
  .div1{
    padding50px;
    displaytable-cell;
    positionabsolute;
    top50%;
    right:50%;
    bottom50%;
    left50%;
    background: pink;
    marginauto;
    }
  .div2{
    padding10px;
    margin-top30px;
    margin-left-50px;
    background: lightblue;
    }
</style>

 然而,效果是这样的:

好了,整理完毕。如果果果大军们有什么意见,或者更好的方法,欢迎交流,随之奉陪哈,谢谢!

原文地址:https://www.cnblogs.com/baaigeini/p/10030345.html