Summary of CSS vertical centering-CSS Tutorial-php.cn

Summary of CSS vertical centering

高洛峰

Release： 2017-02-27 15:15:22

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Foreword: This is the author’s own understanding and organization after studying. If there are any errors or questions, please correct me and I will continue to update!

Vertical centering is used in many places and there are many solutions.

Known element width You can use position positioning + negative margin method

Absolute positioning + 0px in all 4 directions + margin: auto You can achieve horizontal centering based on the parent container; if you only need vertical centering, you can delete left and right, and there are many methods of horizontal centering.
Absolute positioning + left 50% + margin left: a negative value of half the width It can be horizontally centered, the right can also be
absolute positioning + top 50% + margin top: a negative value of half the height can be vertically centered, and the bottom can also be

Summary of CSS vertical centering

<!DOCTYPE html><html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            *{
                padding: 0;
                margin: 0;
            }
            .wrapper{
                width: 500px;
                height: 500px;
                background: #f90;
                left: 0;
                right: 0;
                top: 0;
                bottom: 0;
                position: absolute;
                margin: auto;
                /*绝对定位 + 4个方向全部0px + margin：auto 可以做到基于父容器水平垂居中*/
                /*如果只需要垂直居中，那可以把left和right删掉，并且水平居中的方法也很多*/
            }
            .content{
                width: 100px;
                height: 200px;
                background: #0f8;
                position: absolute;
                /*position: absolute基于第一个不是position：static的父级元素定位*/
                left: 50%;
                top: 50%;
                margin-left: -50px;
                margin-top: -100px;
                /*绝对定位 + 左50% + margin左：宽度一半的负值 可以做到水平居中  右也可以*/
                /*绝对定位 + 上50% + margin上：高度一半的负值 可以做到垂直居中  底部也可以*/
            }
        </style>
    </head>
    <body>
        <p class="wrapper">
            <span class="content"></span>
        </p>
    </body></html>

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Unknown element width You can use position positioning + transform:translate (x, y) to move
Absolute positioning + upper 50% + lower 50% + transform:translate (-50%, -50%) to achieve vertical centering

<!DOCTYPE html><html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            *{
                padding: 0;
                margin: 0;
            }
            .wrapper{
                width: 500px;
                height: 500px;
                background: #f90;
                left: 0;
                right: 0;
                top: 0;
                bottom: 0;
                position: absolute;
                margin: auto;
                /*绝对定位 + 4个方向全部0px + margin：auto 可以做到基于父容器水平垂居中*/
                /*如果只需要垂直居中，那可以把left和right删掉，并且水平居中的方法也很多*/
            }
            .content{
                width: 100px;
                height: 200px;
                background: #0f8;
                position: absolute;
                /*position: absolute基于第一个不是position：static的父级元素定位*/
                left: 50%;
                top: 50%;
                transform: translate(-50%,-50%);
                /*transform变化、使...变形、转换；transform属性应用于元素的2D或3D转换。这个属性允许你将元素移动，旋转，缩放，倾斜*/
                /*translate平移,是transform的属性值的一部分*/
                /*transition过渡、转变；可多个样式的变换效果*/
            }
        </style>
    </head>
    <body>
        <p class="wrapper">
            <span class="content"></span>
        </p>
    </body></html>

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##The img image in p is vertically centered :

You can use vertical-align:middle, but this attribute only works on elements of the inline-block type (inline also has an impact). I have to continue to learn about vertical-align. I welcome your corrections.

Summary of CSS vertical centering Method 1: Image vertical-align:middle + the height of the parent element is consistent with the line-height

<!DOCTYPE html><html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            *{
                padding: 0;margin: 0;
            }
            .wrapper{
                height: 300px;
                line-height: 300px;
                width: 300px;
                margin:100px auto;
                background: #f90;
                text-align: center;
            }
            .wrapper img{
                width: 150px;
                vertical-align: middle;
            }
        </style>
    </head>
    <body>
        <p class="wrapper">
            <img src="images/1.jpg" alt="美女" title="美女"/>
        </p>
    </body></html>

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Method 2: Parent element settings display: table-cell and vertical-align

<!DOCTYPE html><html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            *{
                padding: 0;margin: 0;
            }
            .wrapper{
                width: 300px;
                height: 300px;
                background: #f90;
                text-align: center;
                vertical-align: middle;
                display: table-cell;
            }
            .wrapper img{
                width: 150px;
            }
        </style>
    </head>
    <body>
        <p class="wrapper">
            <img src="images/1.jpg" alt="美女" title="美女"/>
        </p>
    </body></html>

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