1、第一类 absolute 和 margin
1.1 position: absolute 和 margin: auto
.parent1 {
width: 300px;
height: 300px;
background: brown;
margin-bottom: 32px;
position: relative;
line-height: 300px;
}
.child1 {
width: 150px;
height: 150px;
background: green;
text-align: center;
line-height: 150px;
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
}
1.2 position: absolute 和 margin: - 一半宽度/高度
.parent2 {
width: 300px;
height: 300px;
background: brown;
margin-bottom: 32px;
position: relative;
}
.child2 {
width: 150px;
height: 150px;
background: green;
text-align: center;
line-height: 150px;
position: absolute;
left: 50%;
top: 50%;
/*自身宽度的一半*/
margin-left: -75px;
/*自身高度的一半*/
margin-top: -75px;
}
2、第二类 position: absolute 和 translate
.parent3 {
width: 300px;
height: 300px;
background: brown;
margin-bottom: 32px;
position: relative;
}
.child3 {
width: 150px;
height: 150px;
background: green;
text-align: center;
line-height: 150px;
position: absolute;
left: 50%;
top: 50%;
/*自身宽高的一半*/
transform: translate(-50%, -50%);
}
3、第三类 flex
.parent4 {
width: 300px;
height: 300px;
background: brown;
margin-bottom: 32px;
display: flex;
justify-content: center;
align-items: center;
}
.child4 {
width: 150px;
height: 150px;
background: green;
text-align: center;
line-height: 150px;
}
代码链接
参考链接