Answers for "how to change the size of a picture keeping the ratio 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;
}