Overview

Boosted includes several components and options for laying out your project, including wrapping containers, a powerful flexbox grid system, a flexible media object, and responsive utility classes.

Contents

Containers

Containers are the most basic layout element in Bootstrap and are required when using our default grid system. Choose from a responsive, fixed-width container (meaning its max-width changes at each breakpoint) or fluid-width (meaning it’s 100% wide all the time).

While containers can be nested, most layouts do not require a nested container.

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

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

<div class="container-fluid">
  ...
</div>

Responsive breakpoints

Since Boosted is developed to be mobile first, we use a handful of media queries to create sensible breakpoints for our layouts and interfaces. These breakpoints are mostly based on minimum viewport widths and allow us to scale up elements as the viewport changes.

Boosted primarily uses the following media query ranges—or breakpoints—in our source Sass files for our layout, grid system, and components.

// Extra small devices (portrait phones, less than 480px)
// No media query since this is the default in Boosted

// Small devices (landscape phones, 480px and up)
@media (min-width: 480px) { ... }

// Medium devices (tablets, 768px and up)
@media (min-width: 768px) { ... }

// Large devices (desktops, 980px and up)
@media (min-width: 980px) { ... }

// Extra large devices (large desktops, 1220px and up)
@media (min-width: 1220px) { ... }

// Extra extra large devices (large desktops, 1380px and up)
@media (min-width: 1380px) { ... }

Since we write our source CSS in Sass, all our media queries are available via Sass mixins:

@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) { ... }
@include media-breakpoint-up(xxl) { ... }
// Example usage:
@include media-breakpoint-up(sm) {
  .some-class {
    display: block;
  }
}

We occasionally use media queries that go in the other direction (the given screen size or smaller):

// Extra small devices (portrait phones, less than 480px)
@media (max-width: 479px) { ... }

// Small devices (landscape phones, less than 768px)
@media (max-width: 767px) { ... }

// Medium devices (tablets, less than 960px)
@media (max-width: 959px) { ... }

// Large devices (desktops, less than 1220px)
@media (max-width: 1219px) { ... }

// Extra large devices (desktops, less than 1380px)
@media (max-width: 1379px) { ... }

// Extra extra large devices (large desktops)
// No media query since the extra-extra-large breakpoint has no upper bound on its width

Once again, these media queries are also available via Sass mixins:

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

There are also media queries and mixins for targeting a single segment of screen sizes using the minimum and maximum breakpoint widths.

// Extra small devices (portrait phones, less than 480px)
@media (max-width: 479px) { ... }

// Small devices (landscape phones, 480px and up)
@media (min-width: 480px) and (max-width: 767px) { ... }

// Medium devices (tablets, 768px and up)
@media (min-width: 768px) and (max-width: 959px) { ... }

// Large devices (desktops, 960px and up)
@media (min-width: 960px) and (max-width: 1219px) { ... }

// Extra large devices (desktops, 1220px and up)
@media (min-width: 1220px) and (max-width: 1379px) { ... }

// Extra extra large devices (large desktops, 1380px and up)
@media (min-width: 1380px) { ... }

These media queries are also available via Sass mixins:

@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) { ... }
@include media-breakpoint-only(xxl) { ... }

Similarly, media queries may span multiple breakpoint widths:

// Example
// Apply styles starting from medium devices (tablets, 768px and up) and  Large devices (desktops, 960px and up)
@media (min-width: 768px) and (max-width: 959px) { ... }

The Sass mixin for targeting the same screen size range would be:

@include media-breakpoint-between(md, xl) { ... }

Z-index

Several Bootstrap components utilize z-index, the CSS property that helps control layout by providing a third axis to arrange content. We utilize a default z-index scale in Bootstrap that’s been designed to properly layer navigation, tooltips and popovers, modals, and more.

We don’t encourage customization of these values; should you change one, you likely need to change them all.

$zindex-dropdown-backdrop:  990 !default;
$zindex-dropdown:          1000 !default;
$zindex-fixed:             1030 !default;
$zindex-sticky:            1030 !default;
$zindex-modal-backdrop:    1040 !default;
$zindex-modal:             1050 !default;
$zindex-popover:           1060 !default;
$zindex-tooltip:           1070 !default;

Background elements—like the backdrops that allow click-dismissing—tend to reside on a lower z-indexs, while navigation and popovers utilize higher z-indexs to ensure they overlay surrounding content.