include screen size

1Min:
2@media (min-width: @screen-sm-min) // >= 768px (small tablet)
3@media (min-width: @screen-md-min) // >= 992px (medium laptop)
4@media (min-width: @screen-lg-min) // >= 1200px (large desktop)
5Max:
6@media (max-width: @screen-xs-max) { // < 768px (xsmall phone)
7@media (max-width: @screen-sm-max) { // < 992px (small tablet)
8@media (max-width: @screen-md-max) { // < 1200px (medium laptop)