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css居中方法

林威
2023-12-01

行内元素

1、水平居中

  • text-align:center;
<div class="parent">
    <span class="child">content</span>
</div>
.parent{
    background-color:red;
    text-align:center;
}
  • fit-content;
    .parent{
        background-color:red;
        width:fit-content;
    }

2、垂直居中

  • line-height(单行文本)
.parent{
    height:200px;
    line-height:200px;
    background-color:red;
}

块级元素

1、水平居中

  • margin:0 auto;
<div class="parent">
    <div class="child"></div>
</div>
.parent{
    background-color:red;
}
.child{
    width:100px;
    margin:0 auto;
    background-color:blue;
}

2、水平垂直居中

  • 定位
.parent{
    position:relative;
    height:200px;
    background-color:red;
}
.child{
    weight:100px;
    height:100px;
    position:absolute;
    background:blue;
    left:calc(50%-50px);
    top:calc(50%-50px);    
}

 

.parent{
    position:relative;
    height:200px;
    background-color:red;
}
.child{
    weight:100px;
    height:100px;
    position:absolute;
    background:blue;
    left:50%;
    top:50%;
    margin-top:-50px;
    margin-left:-50px;
}
  • 定位+transform
.parent{
    position:relative;
    height:200px;
    background-color:red;
}
.child{
    position:absolute;
    background:blue;
    left:50%;
    top:50%;
    transform:translate(-50%,-50%);
}
  • 定位+margin
.parent{
    position:relative;
    height:200px;
    background-color:red;
}
.child{
    width:100px;
    height:100px;
    position:absolute;
    left:0;
    right:0;
    top:0;
    botttom:0;
    margin:auto;
    background:blue;
}
  • padding
.parent{
    padding:20px;
    background-color:red;
}
.child{
    height:200px;
    background:blue;
}
  • flex
.parent{
    height:200px;
    display:flex;
    align-items:center;     //垂直居中
    justify-content:center; //水平居中
    background-color:red;
}
.child{
    width:100px;
    height:100px;
    background-color:blue;
}
  • 伪元素
.parent{
    height:200px;
    text-align:center;
    background-color:red;
}
.child{
    width:100px;
    height:100px;
    display:inline-block;
    vertical-align:middle;
    background-color:blue;
}
.parent::before{
    content:"";
    width:20px;
    height:200px;
    display:inline-block;
    vertical-align:middle;
    background-color:yellow;
}
  • calc(宽高相等)
    .parent{
        width:600px;
        height:600px;
        background-color:red;
    }
    .child{
        width:100px;
        height:100px;
        padding:calc((100%-100px)/2);
        background-clip:content-box;
        background-color:blue;
    }

     

 

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