Using media breakpoints in Bootstrap 4-alpha

Question

In Bootstrap 3 I use this:

.something {     padding: 5px;     @media screen and (min-width: $screen-sm-min) {          padding: 20px;     }     @media screen and (min-width: $screen-md-min) {          padding: 40px;     } } 

How can I do the same thing in Boostrap 4-alpha? I can't find an example in their docs. This is in variables.scss

$grid-breakpoints: (   xs: 0,   sm: 576px,   md: 768px,   lg: 992px,   xl: 1200px ) !default; @include _assert-ascending($grid-breakpoints, "$grid-breakpoints"); @include _assert-starts-at-zero($grid-breakpoints); 

Answer 1

Update: Bootstrap 5.

v5 breakpoints reference

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Original answer: Use breakpoint mixins like this:

.something {     padding: 5px;     @include media-breakpoint-up(sm) {          padding: 20px;     }     @include media-breakpoint-up(md) {          padding: 40px;     } } 

v4 breakpoints reference

v4 alpha6 breakpoints reference

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Below full options and values.

Breakpoint & up (toggle on value and above):

@include media-breakpoint-up(xs) { ... } @include media-breakpoint-up(sm) { ... } @include media-breakpoint-up(md) { ... } @include media-breakpoint-up(lg) { ... } @include media-breakpoint-up(xl) { ... } 

breakpoint & up values:

// Extra small devices (portrait phones, less than 576px) // No media query since this is the default in Bootstrap  // Small devices (landscape phones, 576px and up) @media (min-width: 576px) { ... }  // Medium devices (tablets, 768px and up) @media (min-width: 768px) { ... }  // Large devices (desktops, 992px and up) @media (min-width: 992px) { ... }  // Extra large devices (large desktops, 1200px and up) @media (min-width: 1200px) { ... } 

breakpoint & down (toggle on value and down):

@include media-breakpoint-down(xs) { ... } @include media-breakpoint-down(sm) { ... } @include media-breakpoint-down(md) { ... } @include media-breakpoint-down(lg) { ... } 

breakpoint & down values:

// Extra small devices (portrait phones, less than 576px) @media (max-width: 575px) { ... }  // Small devices (landscape phones, less than 768px) @media (max-width: 767px) { ... }  // Medium devices (tablets, less than 992px) @media (max-width: 991px) { ... }  // Large devices (desktops, less than 1200px) @media (max-width: 1199px) { ... }  // Extra large devices (large desktops) // No media query since the extra-large breakpoint has no upper bound on its width 

breakpoint only:

@include media-breakpoint-only(xs) { ... } @include media-breakpoint-only(sm) { ... } @include media-breakpoint-only(md) { ... } @include media-breakpoint-only(lg) { ... } @include media-breakpoint-only(xl) { ... } 

breakpoint only values (toggle in between values only):

// Extra small devices (portrait phones, less than 576px) @media (max-width: 575px) { ... }  // Small devices (landscape phones, 576px and up) @media (min-width: 576px) and (max-width: 767px) { ... }  // Medium devices (tablets, 768px and up) @media (min-width: 768px) and (max-width: 991px) { ... }  // Large devices (desktops, 992px and up) @media (min-width: 992px) and (max-width: 1199px) { ... }  // Extra large devices (large desktops, 1200px and up) @media (min-width: 1200px) { ... } 

Answer 2

I answered a similar question here

As @Syden said, the mixins will work. Another option is using SASS map-get like this..

@media (min-width: map-get($grid-breakpoints, sm)){   .something {     padding: 10px;    } }  @media (min-width: map-get($grid-breakpoints, md)){   .something {     padding: 20px;    } } 

http://www.codeply.com/go/0TU586QNlV

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Bootstrap 4 Breakpoints demo