how use a div to cover a image css code example

Example 1: css image fit in div with aspect ratio

img {
    width: 100%;
    height: 100%; 
    object-fit: contain;
}

Example 2: is there an img cover

body {
  margin: 0;
}
img {
  display: block;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
}

Example 3: make image stretch to fit div

Just apply without any changing any code
img {
width: 100%;
}