You can apply these helper classes to almost any element, in order to alter its style.
text-primary - Primary texttext-light - Light texttext-white - White texttext-dark - Dark texttext-grey - Grey texttext-error - Error texttext-success - Success textbg-primary - primary backgroundbg-light - Light backgroundbg-dark - Dark backgroundbg-grey - Grey backgroundbg-error - Error backgroundbg-success - Success backgroundbd-primary - primary borderbd-light - Light borderbd-dark - Dark borderbd-grey - Grey borderbd-error - Error borderbd-success - Success borderpull-right - floats an element to the rightpull-left - floats an element to the leftis-text-center - center aligns textis-text-left - left aligns textis-text-right - right aligns textis-text-uppercase - text to uppercaseis-text-lowercase - text to lowercaseis-text-capitalize - capitalizes textis-full-screen - makes the element 100% view heightis-full-width - make the element 100% widthis-vertical-align - vertically centers element using flexis-horizontal-align - horizontal centers element using flexis-center - centers element using flexis-right - right aligns element using flexis-left - left aligns element using flexis-fixed - fixed positioned elementis-paddingless - removes any paddingis-marginless - removes any marginclearfix - clears the floatsis-hidden - hides the element completelyhide-xs - hides the element for screens <600pxhide-sm - hides the element for screens >=600px and <900pxhide-md - hides the element for screens >=900px and <1200pxhide-lg - hides the element for screens >=1200px