Question

How can you align an image inside of a containing div ?

Example

In my example, I need to vertically center the <img> in the <div> with class ="frame " :

<div class="frame" style="height: 25px;">
    <img src="http://jsfiddle.net/img/logo.png" />
</div>

.frame 's height is fixed and image's height is unknown. I can add new elements in .frame if that's the only solution. I'm trying to do this on IE≥7, Webkit, Gecko.

See the jsfiddle here

---

The only (and the best cross-browser) way as I know is to use an inline-block helper with height: 100% and vertical-align: middle on both elements.

So there is a solution: http://jsfiddle.net/kizu/4RPFa/4570/

.frame {
    height: 25px;      /* equals max image height */
    width: 160px;
    border: 1px solid red;
    white-space: nowrap; /* this is required unless you put the helper span closely near the img */
    
    text-align: center; margin: 1em 0;
}

.helper {
    display: inline-block;
    height: 100%;
    vertical-align: middle;
}

img {
    background: #3A6F9A;
    vertical-align: middle;
    max-height: 25px;
    max-width: 160px;
}

<div class=frame>
    <span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=250 />
</div>
<div class=frame>
    <span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=25 />
</div>
<div class=frame>
    <span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=23 />
</div>
<div class=frame>
    <span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=21 />
</div>
<div class=frame>
    <span class="helper"></span><img src="http://jsfiddle.net/img/logo.png" height=19 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=17 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=15 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=13 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=11 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=9 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=7 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=5 />
</div>
<div class=frame>
    <span class="helper"></span>
    <img src="http://jsfiddle.net/img/logo.png" height=3 />
</div>

---

This might be useful:

div {
    position:relative;
    width:200px;
    height:200px;
}
img {
    position:absolute;
    top:0;
    bottom:0;
    margin:auto;
}
.image {
    min-height:50px
}

Reference : http://www.student.oulu.fi/~laurirai/www/css/middle/

---

matejkramny's solution is a good start, but oversized images have a wrong ratio.
Here's my fork:

demo: https://jsbin.com/lidebapomi/edit?html,css,output

---

HTML:

<div class="frame">
  <img src="foo"/>
</div>

CSS:

.frame {  
    height: 160px; /*can be anything*/
    width: 160px; /*can be anything*/
    position: relative;
}
img {  
    max-height: 100%;  
    max-width: 100%; 
    width: auto;
    height: auto;
    position: absolute;  
    top: 0;  
    bottom: 0;  
    left: 0;  
    right: 0;  
    margin: auto;
}

链接地址: http://www.djcxy.com/p/6614.html

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