1.定位实现水平垂直居中
<div class="outer">
<div class="test inner1">定位实现水平垂直居中</div>
</div>
<style>
.outer {
width: 300px;
height: 300px;
border: 1px solid gray;
margin: 100px auto 0;
position: relative;
}
.test {
width: 100px;
height: 100px;
background-color: orange;
}
.inner1 {
/* 方法一 定位*/
position: absolute;
/* 相对于包含块,最近的定位的祖先或父元素 */
top: 50%;
left: 50%;
margin-left: -50px;
margin-top: -50px;
}
</style>
2.定位+位移
<div class="outer">
<div class="test inner2">定位+位移</div>
</div>
<style>
.outer {
width: 300px;
height: 300px;
border: 1px solid gray;
margin: 100px auto 0;
position: relative;
}
.test {
width: 100px;
height: 100px;
background-color: orange;
}
.inner2 {
position: absolute;
top: 50%;
left: 50%;
/*方法二 translate中的百分比是相对自身,50% 相当于100*50% = 50*/
transform: translate(-50%, -50%);
}
</style>
3.相对于整个视口水平垂直居中
<div class="view">相对于整个视口水平垂直居中</div>
<style>
body {
position: relative;
}
/* 方法三 */
.view {
width: 100px;
height: 100px;
background-image: linear-gradient(red, yellow, green);
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
}
</style>
4.flex+margin
<head>
<style>
.outer {
width: 400px;
height: 400px;
background-color: gray;
display: flex;
}
.inner {
width: 100px;
height: 100px;
margin: auto;
background-image: linear-gradient(green, yellow);
}
</style>
</head>
<body>
<div class="outer">
<div class="inner"></div>
</div>
</body>
5. flex 水平垂直居中
<head>
<style>
.outer {
width: 400px;
height: 400px;
background-color: gray;
display: flex;
/* 水平居中 */
justify-content: center;
/* 垂直居中 */
align-items: center;
}
.inner {
width: 100px;
height: 100px;
background-image: linear-gradient(green, yellow);
}
</style>
</head>
<body>
<div class="outer">
<div class="inner"></div>
</div>
</body>
6.遮挡层文章来源:https://www.toymoban.com/news/detail-645217.html
文章来源地址https://www.toymoban.com/news/detail-645217.html
<div class="item"></div>
/* 遮挡层 */
.item {
background-image: repeating-linear-gradient(red 200px, yellow 500px, green 700px);
opacity: 0.5;
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
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