Proportional box for image

Centered image in proportional box

by rulokc

HTML

<div class="container">
    
    <div class="picture">
        <a href="#">
            <img src="http://lorempixel.com/300/100/nature/"/>
        </a>
    </div>
    
</div>

CSS

.container {
    width: 50%;
    margin: 0 auto;
}
.picture {
    background-color: #ddd;
    height: 0;
    padding-bottom: 100%;
    overflow: hidden;
    position: relative;
}
.picture img {
    display: block;
    position: absolute;
    top: 0; right: 0; bottom: 0; left: 0;
    margin: auto;
}