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The method to achieve vertical centering in css is as follows:
1. Use line-height to achieve centering. This method is suitable for pure text;
<!-- css -->
<style>
.parents {
height: 400px;
line-height: 400px;
width: 400px;
border: 1px solid red;
text-align: center;
}
.child {
background-color: blue;
color: #fff;
}
</style>
</head>
<body>
<!-- html -->
<div class="parents">
<span class="child">css布局,实现垂直居中</span>
</div>
</body>Effect:
(Recommended tutorial: CSS tutorial)
2. By setting the relative positioning of the parent container, the child Absolute positioning is set at the level, and the label is adaptively centered through margin;
<!-- css -->
<style>
.parents {
height: 400px;
width: 400px;
border: 1px solid red;
position: relative;
}
.child {
width: 200px;
height: 100px;
line-height: 100px;
text-align: center;
color: #fff;
background-color: blue;
/* 四个方向设置为0, 然后通过margin为auto自适应居中 */
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}
</style>
</head>
<body>
<!-- html -->
<div class="parents">
<span class="child">css布局,实现垂直居中</span>
</div>
</body> Effect:
3. Flexible layout flex parent setting display: flex; Set the margin of the child to auto to achieve adaptive centering;
<!-- css -->
<style>
.parents {
height: 400px;
width: 400px;
border: 1px solid red;
display: flex;
}
.child {
width: 200px;
height: 100px;
line-height: 100px;
text-align: center;
color: #333;
background-color: yellow;
margin: auto;
}
</style>
</head>
<body>
<!-- html -->
<div class="parents">
<span class="child">css布局,实现垂直居中</span>
</div>
</body>Effect:
4. The parent sets relative positioning and the child sets absolute positioning. , and achieved through displacement transform;
<!-- css -->
<style>
.parents {
height: 400px;
width: 400px;
border: 1px solid red;
position: relative;
}
.child {
width: 200px;
height: 100px;
line-height: 100px;
text-align: center;
color: #fff;
background-color: green;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<!-- html -->
<div class="parents">
<span class="child">css布局,实现垂直居中</span>
</div>
</body>Effect:
5. The parent sets the elastic box and sets the related properties of the elastic box;
<!-- css -->
<style>
.parents {
height: 400px;
width: 400px;
border: 1px solid red;
display: flex;
justify-content: center; /* 水平 */
align-items: center; /* 垂直 */
}
.child {
width: 200px;
height: 100px;
color: black;
background-color: orange;
}
</style>
</head>
<body>
<!-- html -->
<div class="parents">
<span class="child"></span>
</div>
</body> Effect:
6. Grid layout, the parent is converted into table form, and then the child is implemented by setting inline or inline blocks. (It should be noted that the prerequisite for the use of vertical-align: middle is inline elements and elements with a display value of table-cell).
Effect:
<!-- css -->
<style>
.parents {
height: 400px;
width: 400px;
border: 1px solid red;
display: table-cell;
text-align: center;
vertical-align: middle;
}
.child {
width: 200px;
height: 100px;
color: #fff;
background-color: blue;
display: inline-block; /* 子元素设置行内或行内块 */
}
</style>
</head>
<body>
<!-- html -->
<div class="parents">
<span class="child"></span>
</div>
</body>Related video tutorial recommendation: css video tutorial
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