垂直水平居中
面试经常问的一个问题,今天来总结下,分两块:居中元素需要高度和不需要高度
先写下都需要的样式和标签元素
- 需要用得到的标签元素
<div class="wrap">
<div class="box">我是居中元素</div>
</div>
- 给body设置宽度
html,body {
width: 100%;
height: 100%;
overflow: hidden;
}
需要高度
1、定位和负margin
.wrap {
position: relative;
width: 100%;
height: 100%;
overflow: hidden;
}
.box {
width: 100px;
height: 100px;
position: absolute;
left: 50%;
top: 50%;
margin-top: -50px;
margin-left: -50px;
background-color: yellowgreen;
}
2、定位和margin:auto
.wrap {
position: relative;
width: 100%;
height: 100%;
}
.box {
width: 100px;
height: 100px;
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
margin: auto;
background-color: yellowgreen;
}
3、定位和calc
calc可获取当前窗口的大小
.wrap {
position: relative;
width: 100%;
height: 100%;
}
.box {
width: 100px;
height: 100px;
position: absolute;
top: calc(50% - 50px);
left: calc(50% - 50px);
background-color: yellowgreen;
}
高度可选
4、定位和transform:translate
transform的translate可根据自身的宽度和高度做出相应的布局
.wrap {
position: relative;
width: 100%;
height: 100%;
}
.box {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
background-color: yellowgreen;
}
5、flex三件套
.wrap {
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
}
.box {
background-color: yellowgreen;
}
6、flex与margin:auto
.wrap {
width: 100%;
height: 100%;
display: flex;
}
.box {
magin: auto;
background-color: yellowgreen;
}
7、table-cell
将容器设为表格单元格,注意容器的宽高不能用百分比,容器的子元素要设为行级块元素或行级元素
.wrap {
width: 500px;
height: 500px;
background-color: aliceblue;
overflow: hidden;
display: table-cell;
text-align: center;
vertical-align: middle;
}
.box {
display: inline-block;
background-color: yellowgreen;
}
8、grid网格布局
.wrap {
width: 100%;
height: 100%;
background-color: aliceblue;
display: grid;
}
.box {
justify-self: center;
align-self: center;
background-color: yellowgreen;
}
9、line-height和text-align
容器要有不是百分比的宽高,子元素是行级块元素,
.wrap {
width: 500px;
height: 500px;
background-color: aliceblue;
text-align: center;
line-height: 500px;
}
.box {
display: inline;
background-color: yellowgreen;
}
目前自己就知道这几种,后期还有在补上…