html responsive image w3schools 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: responsive img
.responsive-img {
max-width:100%;
display:block;
height:auto;
}