块级元素水准，垂直居中的两种方式 _Web前端

块级元素水平，垂直居中的两种方式

方式一：利用margin

<!DOCTYPE html>
<html>
    <head>
        <title>块级元素水平，垂直居中</title>
        <meta charset="utf-8">
        <style>
            .wrapper {
                height: 600px;
                border: 1px solid gray;
            }
            .box {
                width: 100px;
                height: 100px;
                background: gold;
                margin: 250px auto 0;
            }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <div class="box"></div>
        </div>
    </body>
</html>

方式二，利用定位及负边距

<!DOCTYPE html>
<html>
    <head>
        <title>块级元素水平，垂直居中</title>
        <meta charset="utf-8">
        <style>
            .wrapper {
                height: 600px;
                border: 1px solid gray;
                position: relative;
            }
            .box {
                width: 100px;
                height: 100px;
                background: gold;
                position: absolute;
                left: 50%;
                top: 50%;
                margin-left: -50px;
                margin-top: -50px;
            }
        </style>
    </head>
    <body>
        <div class="wrapper">
            <div class="box"></div>
        </div>
    </body>
</html>