CSS

keep aspect ratio of image css

img {
    display: block;
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
}

how to set image size without changing aspect ratio in css

img {
  display: block;
  max-width:230px;
  max-height:95px;
  width: auto;
  height: auto;
}

css keep aspect ratio image

.image-full {
    background: url(...some image...) no-repeat;
    background-size: cover;
    background-position: center center;
}

preserve aspect ratio image css

/* Simply add width without height,
aspect ratio will be maintained 
and height will be calculated accordingly*/

img {
  width: 100px;
}