How to center an image vertically

Type 1, centering effect

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/*第1种，垂直居中效果*/
.box{
       width: 200px;height: 200px;border: 1px solid #ccc;
       position: relative;
  }
.center{
      width: 100px;height: 100px;background: gray;
      margin: auto;position: absolute;top: 0;left: 0;bottom: 0;right: 0;
    }

The second type of picture is centered

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/*第2种 图片垂直居中*/
/* span是辅助元素 vertical-align这个属性的特点,它是相对兄弟级行高（line-height）来定位*/

.box2{
    width: 350px;height: 350px;border: 1px solid #F22727;
    text-align: center;
}
.center2{ vertical-align: middle;}
.block{ line-height: 350px;}/*跟父级一样高*/

The third type, centered effect parent element Use display: table; child element display: table-cell;
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/*第3种，居中效果*/
.box3{
    width: 350px;height: 350px;border: 1px solid #F22727;display: table;text-align: center;
}
.center3{
    display: table-cell;vertical-align: middle;
}

Type 4, centering effect
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/*第4种，居中效果  根据父元素来计算*/
.box4{
    width:300px;height: 300px;border: 1px solid #F22727;
}
.center4{
    width: 200px;height: 200px;position: relative;left: 16%;top: 19%;
}

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