Containers are a fundamental building block of CoreUI for Bootstrap that contain, pad, and align your content within a given device or viewport.

How they work

Containers are the most basic layout element in CoreUI for Bootstrap and are required when using our default grid system. Containers are used to contain, pad, and (sometimes) center the content within them. While containers can be nested, most layouts do not require a nested container.

CoreUI for Bootstrap comes with three different containers:

  • .container, which sets a max-width at each responsive breakpoint
  • .container-{breakpoint}, which is width: 100% until the specified breakpoint
  • .container-fluid, which is width: 100% at all breakpoints

The table below illustrates how each container’s max-width compares to the original .container and .container-fluid across each breakpoint.

Extra small
.container 100% 540px 720px 960px 1140px 1320px
.container-sm 100% 540px 720px 960px 1140px 1320px
.container-md 100% 100% 720px 960px 1140px 1320px
.container-lg 100% 100% 100% 960px 1140px 1320px
.container-xl 100% 100% 100% 100% 1140px 1320px
.container-xxl 100% 100% 100% 100% 100% 1320px
.container-fluid 100% 100% 100% 100% 100% 100%

Default container

Our default .container class is a responsive, fixed-width container, meaning its max-width changes at each breakpoint.

<div class="container">
  <!-- Content here -->

Responsive containers

Responsive containers 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, xl, and xxl.

<div class="container-sm">100% wide until small breakpoint</div>
<div class="container-md">100% wide until medium breakpoint</div>
<div class="container-lg">100% wide until large breakpoint</div>
<div class="container-xl">100% wide until extra large breakpoint</div>
<div class="container-xxl">100% wide until extra extra large breakpoint</div>

Fluid containers

Use .container-fluid for a full width container, spanning the entire width of the viewport.

<div class="container-fluid">


As shown above, CoreUI for Bootstrap generates a series of predefined container classes to help you build the layouts you desire. You may customize these predefined container classes by modifying the Sass map (found in _variables.scss) that powers them:

$container-max-widths: (
  sm: 540px,
  md: 720px,
  lg: 960px,
  xl: 1140px,
  xxl: 1320px

In addition to customizing the Sass, you can also create your own containers with our Sass mixin.

// Source mixin
@mixin make-container($padding-x: $container-padding-x) {
  width: 100%;
  padding-right: $padding-x;
  padding-left: $padding-x;
  margin-right: auto;
  margin-left: auto;

// Usage
.custom-container {
  @include make-container();

For more information and examples on how to modify our Sass maps and variables, please refer to the Sass section of the Grid documentation.