Make the container of an image keep the size and aspect ratio of the image.
.intrinsic-ratio-container {
position: relative;
padding-bottom: 56.285714%; /* This defines the aspect ratio. */
height: 0;
color: #ddd; /* Same color as background-color to hide the image description text. */
background-color: #ddd;
overflow: hidden;
}
.intrinsic-ratio-image {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
color: transparent !important;
}