行内元素的居中
程度居中
text-align:center;
<body>
<div class="parent">
<span class="child">content</span>
</div>
</body>
<style>
.parent{
background-color: red;
text-align: center;
}
</style>
fit-content;
<body>
<div class="parent">
<span class="child">content</span>
</div>
</body>
<style>
.parent{
background-color: red;
width: fit-content;/*父元素适应子元素的宽度*/
margin: auto;
}
</style>
垂直居中
line-height;(只针对单行文本)
<body>
<div class="parent">
<span class="child">content</span>
</div>
</body>
<style>
.parent{
background-color: red;
height: 200px;
line-height: 200px;
}
</style>
块级元素的居中
程度居中
* margin:0 auto;
<body>
<div class="parent">
<div class="child">content</div>
</div>
</body>
<style>
.parent{
background-color: red;
}
.child{
background-color: blue;
width: 100px;
margin: 0 auto;/*左右自适应*/
}
</style>程度垂直居中
- 定位
<body>
<div class="parent">
<div class="child"></div>
</div>
</body>
<style>
.parent{
background-color: red;
position: relative;
height: 200px;
}
.child{
background-color: blue;
width: 100px;
height: 100px;
position: absolute;
left: 50%;
top: 50%;
margin-top: -50px;
margin-left: -50px;
}
</style>2.定位+transform
<body>
<div class="parent">
<div class="child"></div>
</div>
</body>
<style>
.parent{
background-color: red;
position: relative;
height: 200px;
}
.child{
background-color: blue;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
/*子元素大小未知*/
}
</style>3.定位+margin
<body>
<div class="parent">
<div class="child"></div>
</div>
</body>
<style>
.parent{
background-color: red;
position: relative;
height: 200px;
}
.child{
background-color: blue;
width: 100px;
height: 100px;
position: absolute;
margin: auto;
left: 0;
right: 0;
top: 0;
bottom: 0;
}
</style>4.padding
<body>
<div class="parent">
<div class="child"></div>
</div>
</body>
<style>
.parent{
padding: 20px;
background-color: red;
}
.child{
height: 200px;
background-color: blue;
}
</style>5.flex
<body>
<div class="parent">
<div class="child"></div>
</div>
</body>
<style>
.parent{
display: flex;
height: 200px;
align-items: center;
justify-content: center;
background-color: red;
}
.child{
height: 100px;
width: 100px;
background-color: blue;
}
</style>6.伪元素
7.函数calc
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