div水平居中，垂直居中的几种方式
假设我们现在要实现box元素的居中
/* 公共代码 */
.wp {
border: 1px solid red;
width: 300px;
height: 300px;
}
.box {
background: green;
}
.box.size{
width: 100px;
height: 100px;
}
/* 公共代码 */
1.box确定宽高
1.1absolute + 负margin
/* 定位代码 */
.wp {
position: relative;
}
.box {
position: absolute;;
top: 50%;
left: 50%;
margin-left: -50px;
margin-top: -50px;
}
1.2absolute + margin auto
.wp {
position: relative;
}
.box {
position: absolute;;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
}
1.3absolute + calc
.wp {
position: relative;
}
.box {
position: absolute;;
top: calc(50% - 50px);
left: calc(50% - 50px);
}
2.box不确定宽高
2.1absolute + transform
.wp {
position: relative;
}
.box {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
2.2.flex布局
.wp {
display: flex;
justify-content: center;
align-items: center;
}
2.3table-cell
.wp {
display: table-cell;
text-align: center;
vertical-align: middle;
}
2.4lineheight
.wp {
line-height: 300px;
text-align: center;
font-size: 0px;
}
.box {
font-size: 16px;
display: inline-block;
vertical-align: middle;
line-height: initial;
text-align: left;
}
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