responsiveness in bootstrap

1/* Extra small devices (phones, less than 768px) */
2/* No media query since this is the default in Bootstrap */
3
4/* Small devices (tablets, 768px and up) */
5@media (min-width: @screen-sm-min) { ... }
6
7/* Medium devices (desktops, 992px and up) */
8@media (min-width: @screen-md-min) { ... }
9
10/* Large devices (large desktops, 1200px and up) */
11@media (min-width: @screen-lg-min) { ... }