DOM结构及css:
<div class="outerbox">
<div class="innerbox"></div>
</div>
.outerbox {
width: 100%;
height: 500px;
background-color: antiquewhite;
}
.innerbox {
width: 200px;
height: 200px;
background-color: aqua;
}
效果展示:
- 方法一:父元素使用相对定位,子元素设置position:absolate; left:50%;top50%;trasnform:translate(-50%,-50%);
.outerbox {
width: 100%;
height: 500px;
background-color: antiquewhite;
position: relative;
}
.innerbox {
width: 200px;
height: 200px;
background-color: aqua;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
效果展示:
- 方法二:父元素相对定位,子元素设置:position:absolute;left:50%;top:50%;margin-left:100px;margin-top:-100px;
.outerbox {
width: 100%;
height: 500px;
background-color: antiquewhite;
position: relative;
}
.innerbox {
width: 200px;
height: 200px;
background-color: aqua;
position: absolute;
top: 50%;
left: 50%;
margin-left: -100px;
margin-top: -100px;
}
效果展示:
- 方法三:父元素使用flex布局,设置样式为:display:flex;algin-items:center;justify-content: center;
.outerbox {
width: 100%;
height: 500px;
background-color: antiquewhite;
display: flex;
align-items: center;
justify-content: center;
}
.innerbox {
width: 200px;
height: 200px;
background-color: aqua;
}
效果展示:
- 父元素使用相对定位,子元素设置:position:absolute;left:0;top:0;bottom:0;right:0;margin:auto;
.outerbox {
width: 100%;
height: 500px;
background-color: antiquewhite;
position: relative;
}
.innerbox {
width: 200px;
height: 200px;
background-color: aqua;
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
}
效果展示:
- 使用grid布局
.outerbox {
width: 100%;
height: 500px;
background-color: antiquewhite;
display: grid;
}
.innerbox {
width: 200px;
height: 200px;
background-color: aqua;
margin: auto;
}
效果展示: