目录
1、文本水平垂直居中
HTML
<div class="text_box">
<span>文本实现垂直水平居中</span>
</div>
CSS
.text_box {
width: 230px;
height: 60px;
/* 水平居中 */
text-align: center;
/* 垂直居中 */
line-height: 60px;
background-color: #ccc;
}
2、使用定位实现水平居中/宽高未知
2.1、transform
HTML
<div class="unknown_wh_box">
<div></div>
</div>
CSS
.unknown_wh_box {
position: relative;
}
.unknown_wh_box>div {
width: 230px;
height: 230px;
background-color: #ccc;
position: absolute;
left: 50%;
transform: translateX(-50%);
}
2.2、margin
HTML
<div class="unknown_wh_box">
<div></div>
</div>
CSS
.unknown_wh_box {
position: relative;
}
.unknown_wh_box>div {
width: 230px;
height: 230px;
background-color: #ccc;
position: absolute;
left: 0;
right: 0;
margin: auto;
}
3、使用定位实现水平垂直居中/宽高已知
3.1、transform
HTML
<div class="known_wh_box">
<div></div>
</div>
CSS
.known_wh_box {
width: 70%;
height: 300px;
position: relative;
background-color: #aaa;
}
.known_wh_box>div {
width: 230px;
height: 230px;
background-color: #ccc;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
3.2、margin
HTML
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<div class="known_wh_box">
<div></div>
</div>
CSS
.known_wh_box {
width: 70%;
height: 360px;
position: relative;
background-color: #aaa;
}
.known_wh_box>div {
width: 230px;
height: 230px;
background-color: #ccc;
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
}
4、弹性布局实现水平垂直居中
4.1、未知宽高
高度会自动被撑开，且紧贴子容器。
HTML
<div class="unknown_wh_box">
<div></div>
</div>
CSS
.unknown_wh_box {
display: flex;
justify-content: center;
align-items: center;
}
.unknown_wh_box>div {
width: 230px;
height: 230px;
background-color: #ccc;
}
4.2、已知宽高
HTML
<div class="known_wh_box">
<div></div>
</div>
CSS
.known_wh_box {
width: 70%;
height: 360px;
background-color: #aaa;
display: flex;
justify-content: center;
align-items: center;
}
.known_wh_box>div {
width: 230px;
height: 230px;
background-color: #ccc;
}