图片水平垂直居中对齐

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假定外层的高度和宽度已经固定，通用的HTML和CSS代码：
Html：

<div class="img">
<img src="http://dummyimage.com/200x200/f66/"/>
</div>

Style:

.img {
	300px;
	height:300px;
	margin:20px auto;
	background:#00f;
}

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####相对定位+margin:auto

利用图片相对于外层浮动，加上margin:auto.

<div class="img img1">
<img src="http://dummyimage.com/200x200/f66/"/>
</div>

.img1 {
	position:relative;
}
.img1 img {
	position:absolute;
	top:0;
	bottom:0;
	left:0;
	right:0;
	margin:auto;
}

####flexbox

利用flexbox里面的垂直居中属性：align-items:center(垂直居中)和justify-content:center(水平居中);

<div class="img img2">
	<img src="http://dummyimage.com/200x200/f66/"/>
</div>

.img2 {
	display:-webkit-box;
	display:-ms-flexbox;
	display:flex-box;
	display:flex;
	-webkit-box-align:center;
	-ms-flex-align:center;
	align-items:center;
	-webkit-box-pack:center;
	-ms-flex-pack:center;
	justify-content:center;
	text-align:center;
}

####table-cell
利用display:table-cell+图片vertical-align:middle

<div class="img img3">
	<span class="icenter"><img src="http://dummyimage.com/200x200/f66/"/></span>
</div>

.img3 .icenter {
	display:table-cell;
	vertical-align:middle;
	text-align:center;
	height:300px;
	300px
}
.img3 img {
	vertical-align:middle;
	display:inline-block
}

####增加一个空白标签

<div class="img img4">
	<img src="http://dummyimage.com/200x200/f66/"/>
	<i class="iblock"></i>
</div>

.img4 {
	text-align:center
}
.img4 img {
	vertical-align:middle
}
.img4 .iblock {
	display:inline-block;
	height:100%;
	0;
	vertical-align:middle
}

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原文地址：http://caibaojian.com/img-vertical-middle.html