bootstrap lg
width 1200 px or greater
large desktop
bootstrap md
width 992 px to 1199 px
small desktop
iPad Landscape (1024px)
bootstrap sm
width 768 px to 991 px
iPad Portrait (768px)
bootstrap xs
width 767 px or less
@media max-width 667px
iPhone 6 & 6 plus landscape (667px)
@media max-width 568px
iPhone 5s landscape (568px)
@media max-width 375px
iPhone 6 & 6 plus portrait (375px)
@media max-width 320px
iPhone 5s portrait (320px)