css image size scale to fit code example

Example 1: make a background image responsive css

html {
   min-height: 100%;
   background-image: url(image.jpg);
   background-size: cover;
   background-repeat: no-repeat;
   background-position: center center;
}

Example 2: resize img to fit

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

Example 3: make image stretch to fit div

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