css布局:如何实现垂直居中?
css布局:如何实现垂直居中?
1.利用line-height实现居中,这种方法适合纯文字类的;
<!-- 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>
2.通过设置父容器相对定位,子级设置绝对定位,标签通过margin实现自适应居中;
<!-- 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>
3.弹性布局flex 父级设置display: flex; 子级设置margin为auto实现自适应居中;
<!-- 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>
4. 父级设置相对定位,子级设置绝对定位,并且通过位移transform实现;
<!-- 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>
5. 父级设置弹性盒子,并设置弹性盒子相关属性;
<!-- 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>
6. 网格布局,父级通过转换成表格形式,然后子级设置行内或行内块实现。(需要注意的是:vertical-align: middle使用的前提条件是内联元素以及display值为table-cell的元素)。
<!-- 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>
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