bootstrap responsive

1Responsive containers are new in Bootstrap v4.4. They allow you to specify a class that is 100% wide until the specified breakpoint is reached, after which we apply max-widths for each of the higher breakpoints. For example, .container-sm is 100% wide to start until the sm breakpoint is reached, where it will scale up with md, lg, and xl.
2
3Copy
4<div class="container-sm">100% wide until small breakpoint</div>
5<div class="container-md">100% wide until medium breakpoint</div>
6<div class="container-lg">100% wide until large breakpoint</div>
7<div class="container-xl">100% wide until extra large breakpoint</div>
8
9
10// Extra small devices (portrait phones, less than 576px)
11// No media query for `xs` since this is the default in Bootstrap
12
13// Small devices (landscape phones, 576px and up)
14@media (min-width: 576px) { ... }
15
16// Medium devices (tablets, 768px and up)
17@media (min-width: 768px) { ... }
18
19// Large devices (desktops, 992px and up)
20@media (min-width: 992px) { ... }
21
22// Extra large devices (large desktops, 1200px and up)
23@media (min-width: 1200px) { ... }
24
25
26Since we write our source CSS in Sass, all our media queries are available via Sass mixins:
27
28// No media query necessary for xs breakpoint as it's effectively `@media (min-width: 0) { ... }`
29@include media-breakpoint-up(sm) { ... }
30@include media-breakpoint-up(md) { ... }
31@include media-breakpoint-up(lg) { ... }
32@include media-breakpoint-up(xl) { ... }
33
34// Example: Hide starting at `min-width: 0`, and then show at the `sm` breakpoint
35.custom-class {
36  display: none;
37}
38@include media-breakpoint-up(sm) {
39  .custom-class {
40    display: block;
41  }
42}
43We occasionally use media queries that go in the other direction (the given screen size or smaller):
44
45// Extra small devices (portrait phones, less than 576px)
46@media (max-width: 575.98px) { ... }
47
48// Small devices (landscape phones, less than 768px)
49@media (max-width: 767.98px) { ... }
50
51// Medium devices (tablets, less than 992px)
52@media (max-width: 991.98px) { ... }
53
54// Large devices (desktops, less than 1200px)
55@media (max-width: 1199.98px) { ... }
56
57// Extra large devices (large desktops)
58// No media query since the extra-large breakpoint has no upper bound on its width
59
60
61Once again, these media queries are also available via Sass mixins:
62
63Copy
64@include media-breakpoint-down(xs) { ... }
65@include media-breakpoint-down(sm) { ... }
66@include media-breakpoint-down(md) { ... }
67@include media-breakpoint-down(lg) { ... }
68// No media query necessary for xl breakpoint as it has no upper bound on its width
69
70// Example: Style from medium breakpoint and down
71@include media-breakpoint-down(md) {
72  .custom-class {
73    display: block;
74  }
75}
76
77$zindex-dropdown:          1000 !default;
78$zindex-sticky:            1020 !default;
79$zindex-fixed:             1030 !default;
80$zindex-modal-backdrop:    1040 !default;
81$zindex-modal:             1050 !default;
82$zindex-popover:           1060 !default;
83$zindex-tooltip:           1070 !default;

1// Extra small devices (portrait phones, less than 576px)
2// No media query 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--------------------------------------------------------------------------------------
2Bootstrap Container Width			 					| Size        | Class Prefix
3--------------------------------------------------------------------------------------
4Extra small devices Phones (less than 768px)  			| None (auto) | .col-xs-
5Small devices Tablets (greater than equals 768px) 		| 750px       | .col-sm-
6Medium devices Desktops (greater than equals 992px)     | 970px       | .col-md-
7Large devices Desktops (greater than equals 1200px)     | 1170px      | .col-lg-