[Fixed]-How can I make image fit in div (django)?

Instead of using 100% use specific value as 100px(or something else) it will fix. but it will not work for image smaller than 100px

img {
    padding: 0;
    display: block;
    margin: 0 auto auto 0;
    max-height: 100px;
    max-width: 100px;
   }

The below code will work for all type of images

 img {
    padding: 0;
    display: block;
    margin: 0 auto auto 0;

    height: 100px;
    width: 100px;
    max-height: 100px;
    max-width: 100px;
   }