CSS水平垂直居中的方法

水平居中：

1.直接加margin：auto

2.使用flex布局

<body>
    <div class="box1"></div>
    <style>
        html,body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }

        body {
            display: flex;
            justify-content: center;
        }
        .box1 {
            width: 200px;
            height: 200px;
            background-color: red;
        }
    </style>
    <script>
    </script>
</body>

 

垂直居中

1.使用flex布局

<style>
// body属于html，div组件属于body，所以要先把html和body撑满
    html,body {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
    }
    body {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .demo1 {
        width: 300px;
        height: 300px;
        background-color: orange;
    }
</style>

 2.使用绝对定位

<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
    <div class="box3"></div>
    <style>
        html,body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }

        body {
            width: 5000px;
        }

        .box1 {
            width: 300px;
            height: 300px;
            background-color: orange;
            /* 这里只要position不为static，即开启position就行，只不过会根据不同的值而变换效果 */
            position: fixed;
        }
        .box2 {
            width: 200px;
            height: 200px;
            background-color: red;
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
        }
        .box3 {
            width: 400px;
            height: 400px;
            background-color: blue;
        }
    </style>
    <script>
    </script>
</body>

3.绝对定位+transform: translate(-50%,-50%);

<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
    <div class="box3"></div>
    <style>
        html,body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }

        body {
            width: 5000px;
        }

        .box1 {
            width: 300px;
            height: 300px;
            background-color: orange;
            position: fixed;
        }
        .box2 {
            width: 200px;
            height: 200px;
            background-color: red;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
        }
    </style>
    <script>
    </script>
</body>

 4.使用table-cell搭配vertical-align

<div id="box">
            <div id="content">bcebcuebcuewbciuebcuecbue</div>
</div>

#box {
                  display: table-cell;
                  width: 200px;
                  height: 200px;
                  vertical-align: middle;
                  background-color: orange;
            }

            #content {
                  background-color: skyblue;
            }

 

 

posted @ 2020-03-30 00:13  ajjoker  阅读(96)  评论(0)    收藏  举报