css breakpoints

1 /* Extra small devices (phones, 600px and down) */
2@media only screen and (max-width: 600px) {...}
3
4/* Small devices (portrait tablets and large phones, 600px and up) */
5@media only screen and (min-width: 600px) {...}
6
7/* Medium devices (landscape tablets, 768px and up) */
8@media only screen and (min-width: 768px) {...}
9
10/* Large devices (laptops/desktops, 992px and up) */
11@media only screen and (min-width: 992px) {...}
12
13/* Extra large devices (large laptops and desktops, 1200px and up) */
14@media only screen and (min-width: 1200px) {...} 

1// Extra small devices (portrait phones, less than 576px)
2// No media query for `xs` since this is the default in Bootstrap
3
4// Small devices (landscape phones, 576px and up)
5@media (min-width: 576px) { ... }
6
7// Medium devices (tablets, 768px and up)
8@media (min-width: 768px) { ... }
9
10// Large devices (desktops, 992px and up)
11@media (min-width: 992px) { ... }
12
13// Extra large devices (large desktops, 1200px and up)
14@media (min-width: 1200px) { ... }

1// Best Practice suggests
2// keep default style for smallest screen size (portrait mobile, below 576px)
3// and then proceed in assending order with media query like below
4
5// Small devices (landscape phones, 576px and above till next break point)
6@media (min-width: 576px) { ... }
7
8// Medium devices (tablets, 768px and above till next break point)
9@media (min-width: 768px) { ... }
10
11// Large devices (desktops, 992px and above till next break point)
12@media (min-width: 992px) { ... }
13
14// so on ...
15

1320px
2480px
3600px
4768px
5900px
61024px
71200px

1The Bootstrap grid system has four classes:
2xs (for phones - screens less than 768px wide)
3sm (for tablets - screens equal to or greater than 768px wide)
4md (for small laptops - screens equal to or greater than 992px wide)
5lg (for laptops and desktops - screens equal to or greater than 1200px wide)