Using sprites for multiple images in CSS

When we need to use several images in CSS, we can consider about using Sprites technology to improve the site loading speed.

Using Sprites in CSS, we can decrease the number of images, which will be directly affect to the decrease the number of HTTP requests.

Resources:

1. https://css-tricks.com/css-sprites/
2. http://www.w3schools.com/css/css_image_sprites.asp
3. https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Images/Implementing_image_sprites_in_CSS