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Bootstrap class: .float-*-none

<div class="float-none">Don't float on all viewport sizes</div>
<div class="float-sm-none">Don't float on viewports sized SM (small) or wider</div>
<div class="float-md-none">Don't float on viewports sized MD (medium) or wider</div>
<div class="float-lg-none">Don't float on viewports sized LG (large) or wider</div>
<div class="float-xl-none">Don't float on viewports sized XL (extra-large) or wider</div>

Preview

Don't float on all viewport sizes
Don't float on viewports sized SM (small) or wider
Don't float on viewports sized MD (medium) or wider
Don't float on viewports sized LG (large) or wider
Don't float on viewports sized XL (extra-large) or wider