Bootstrap includes dozens of utilities—classes with a single purpose to reduce the frequency of highly repetitive declarations.
Allow browsers to determine video or slideshow dimensions based on the width of their containing block by creating an intrinsic ratio that will properly scale on any device.
Rules are directly applied to
<object> elements; optionally use an explicit descendant class
.embed-responsive-item when you want to match the styling for other attributes.
Pro-Tip! You don’t need to include
frameborder="0" in your
<iframe>s as we override that for you.
<div class="embed-responsive embed-responsive-16by9"> <iframe class="embed-responsive-item" src="//www.youtube.com/embed/zpOULjyy-n8?rel=0" allowfullscreen></iframe> </div>
Aspect ratios can be customized with modifier classes.
These utility classes float an element to the left or right, or disable floating, based on the current viewport size using the CSS
!important is included to avoid specificity issues. These use the same viewport width breakpoints as the grid system.
Two similar non-responsive Sass mixins (
float-right) are also available.
<div class="float-left">Float left on all viewport sizes</div><br> <div class="float-right">Float right on all viewport sizes</div><br> <div class="float-none">Don't float on all viewport sizes</div><br> <div class="float-sm-left">Float left on viewports sized SM (small) or wider</div><br> <div class="float-md-left">Float left on viewports sized MD (medium) or wider</div><br> <div class="float-lg-left">Float left on viewports sized LG (large) or wider</div><br> <div class="float-xl-left">Float left on viewports sized XL (extra-large) or wider</div><br>