居中布局
- 水平居中
- 行内元素: text-align: center
- 块级元素: margin: 0 auto
- absolute + transform
- flex + justify-content: center
- 垂直居中
- line-height: height
- absolute + transform
- flex + align-items: center
- table
- 水平垂直居中
- absolute + transform
- flex + justify-content + align-items
两种以上方式实现已知或者未知宽度的垂直水平居中
1
.wrapper {
position: relative;
width: 300px;
height: 300px;
background-color: #00000030;
}
.wrapper .box {
position: absolute;
top: 50%;
left: 50%;
width: 100px;
height: 100px;
margin: -50px 0 0 -50px;
background-color: #000;
}
2.
position: relative;
top: 0;
100%;
height: 100%;
z-index: 2;
top: 40%;
left: 50%;
transform: translate(-50%, -50%);
3
.wrapper {
display: flex;
width: 300px;
height: 300px;
display: flex;
justify-content: center;
align-items: center;
background-color: #00000030;
}
.wrapper .box {
width: 100px;
/* height: 100px; */
height: 100px;
background-color: #000;
}