Helper classes

Images
.img-responsive Images only Applies max-width: 100%; and height: auto; to the image so that it scales nicely to the parent element
.img-rounded Images only Adds rounded 3px border radius to the image
.img-circle Images only Makes image fully rounded
.img-thumbnail Images only Adds grey frame with white background color
.img-lg (*-sm, *-xs) Images only Optional custom sizing. Added specially for media lists
.img-10 Images only Image width 10%
.img-15 Images only Image width 15%
.img-20 Images only Image width 20%
.img-30 Images only Image width 30%
.img-40 Images only Image width 40%
.img-50 Images only Image width 50%
.img-60 Images only Image width 60%
.img-70 Images only Image width 70%
.img-80 Images only Image width 80%
.img-90 Images only Image width 90%
.img-100 Images only Image width 100%
Styling
.cursor-move Any element Changes cursor style to move. Mostly used in sortable components
.cursor-pointer Any element Changes cursor style to pointer. Useful for user interaction feedback
.cursor-default Any element Changes cursor style to default
.border-* Any element Adds 1px border to the element, if it doesn't have it already. Available in 4 positions: top, bottom, left, right
.border-lg Any element Changes border width to 2px
.border-*-lg Any element Does the same as .border-lg, but here you can specify border position: left, right, top and bottom
.border-xlg Any element Changes border width to 3px
.border-*-xlg Any element Does the same as .border-xlg, but here you can specify border position: left, right, top and bottom
.no-border-radius Any element Removes border radius from the element. Supports 4 sidebar separately, to use add .*-top (bottom, left, right) suffix
.text-highlight Text only Text highlighted
.text-size-extralarge Text only Font size 20px
.text-size-large Text only Font size 18px
.text-size-normal Text only Font size 14px
.text-size-small Text only Font size 12px
.text-size-mini Text only Font size 10px
Transformations
.rotate-45 Any element Rotates element 45 degreees clockwise
.rotate-45-inverse Any element Rotates element 45 degreees counterclockwise
.rotate-90 Any element Rotates element 90 degreees clockwise
.rotate-90-inverse Any element Rotates element 90 degreees counterclockwise
.rotate-180 Any element Rotates element 180 degreees clockwise
.rotate-180-inverse Any element Rotates element 180 degreees counterclockwise
.spinner Any element Adds infinite clockwise rotation
.spinner-inverse Any element Adds infinite counterclockwise rotation
Positioning
.center-block Any element Set an element to display: block and center via margin
.position-relative Any element Changes element's positiion to relative
.position-static Any element Changes element's positiion to static
.pull-left Any element Float an element to the left with a class
.pull-right Any element Float an element to the right with a class
.pull-right-xs
*-sm, *-md, *-lg
Any element Float an element to the right on specified screen sizes only
.valign-top
*-middle, *-bottom, *-baseline
*-text-top, *-text-bottom
Any element Helper classes for vertical element alignment
.clearfix Any element Easily clear floats by adding .clearfix to the parent element
Spacing
.position-left Inline elements Add extra right margin to the element
.position-right Inline elements Add extra left margin to the element
.m-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px margin to the element
.mt-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px top margin to the element
.mb-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px bottom margin to the element
.ml-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px left margin to the element
.mr-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px right margin to the element
.no-margin Any element Removes element's margin
.no-margin-top
(*-bottom, *-left, *-right)
Any element Removes margin of the specified side
.p-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px padding to the element
.pt-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px top padding to the element
.pb-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px bottom padding to the element
.pl-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px left padding to the element
.pr-5
(*-10, *-15, *-20)
Any element Add 5, 10, 15 and 20 px right padding to the element
.no-padding Any element Removes element's padding
.no-padding-top
(*-bottom, *-left, *-right)
Any element Removes padding of the specified side
Appearance
.width-100
*-200, *-300 ... *-800
Dropdown menus Sets a fixed width of the dropdown menu in pixels
.pre-scrollable Containers Sets a max-height of 350px and provide a y-axis scrollbar
.overflow-hidden Containers Clips content overflow, makes the rest of the content invisible
.overflow-visible Containers Shows content overflow, makes the rest of the content visible
.overflow-auto Containers Clips content overflow, makes the rest of the content scrollable
.display-block Any element Displays an element as a block element
.display-inline-block Any element Displays an element as an inline-level block container