Image at center Vertically

by Rayudu Ikkurthi

HTML

<div class="responsive-container">
    <div class="dummy"></div>
    <div class="img-container">
        <img src="http://lorempixel.com/400/200/food" alt="" />
    </div>
</div>

CSS

.responsive-container {
    position: relative;
    width: 100%;
    border: 1px solid black;
    overflow: hidden;
}

.dummy {
    padding-top: 100%; /* forces 1:1 aspect ratio */
}

.img-container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center; /* align horizontal */
    align-items: center; /* align vertical */
}