my responsive image code example

Example 1: responsive img

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

Example 2: responsive image using media query

.img {
  background-image: url(examples/images/image-384.jpg); 
}
@media 
  (-webkit-min-device-pixel-ratio: 2), 
  (min-resolution: 192dpi) { 
  .img {
    background-image: url(examples/images/image-768.jpg);
  }
}