CSS元素居中

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居中

  • 单行文本水平垂直&垂直居中: text-align、line-height, 元素必须有高度
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<style>
    .single-text {
        height: 50px;
        line-height: 50px;
        background: #000;
        color:#ee00ff;
        text-align: center;
    }
</style>
<div class="single-text">
    这里是一个单行文本
</div>
  • 多行文本垂直居中: display: table-cell 、vertical-align: middle;
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<style>
    .mult-text {
        width: 400px;
        height: 90px;
        background: #ee00ff;
        color: #000;
        display: table-cell;
        vertical-align: middle;
    }
</style>
<div class="mult-text">
    多行文本垂直居中: display: table-cell 、vertical-align: middle;
</div>
  • div 垂直居中: 父元素 display: table-cell; vertical-align: middle;
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<style>
    .table-parent {
        background: #000;
        height: 60px;
        display: table-cell;
        color: #fff;
        vertical-align: middle;
    }
</style>
<div class="table-parent">
    <div class="table">
        display: table-cell;
    </div>
</div>
  • div水平垂直居中: 父元素relative. 子元素: absolute left right bottom top : 9; margin: auto; 子元素有高度、宽度
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<style>
    .relative-parent {
        background: #000;
        height: 90px;           
        color: #fff;
        position: relative;
    }
    .position-child {
        position: absolute;
        height: 50px;
        width: 300px;
        left: 0;
        right: 0;
        bottom: 0;
        top: 0;
        margin: auto;
    }
</style>
<div class="relative-parent">
    <div class="position-child">
        父元素relative. 子元素: absolute;
    </div>
</div>
  • 绝对定位&负值, 子元素有宽度、高度
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<style>
    .parent {
        position: relative;
        width: 200px;
        height: 200px;
        background-color: #e0ffee;
    }
    .child {
        position: absolute;
        width: 100px;
        height: 100px;
        top: 50%;
        margin-top: -50px;
        left: 50%;
        margin-left: -50px;
        background: #2545c4;
    }
</style>
<div class="parent">
    <div class="child"></div>
</div>
  • 同上.绝对定位&translate 子元素不需要有宽度、高度
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<style>
    .parent-translate {
        position: relative;
        width: 200px;
        height: 200px;
        background-color: #e0ffee;
    }
    .child-translate {
        position: absolute;
        background: #2545c4;
        left: 50%;
        top: 50%;
        padding: 20px;
        transform: translateX(-50%) translateY(-50%);
    }
</style>
<div class="parent-translate">
    <div class="child-translate">
        哈哈这里是一个子元素哦哦哦哦
    </div>
</div>
  • div水平垂直居中: 负元素dispaly: flex; juestify-content: center; align-item: center;
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<style>
    .flex-parent {
        background: #2545c4;
        height: 90px;
        color: #fff;
        display: flex;
        justify-content: center;
        align-items: center;

    }
    .flex-child {
        background-color: #e0ffee;
    }
</style>
<div class="flex-parent">
    <div class="flex-child">
        父元素flex
    </div>
</div>