## Utility classes

Utility classes — formerly helper classes to speed up your development process.

For faster mobile-friendly and responsive development, Bootstrap includes dozens of utility classes for showing, hiding, aligning, and spacing content.

Bootstrap utilities

We have added new utility classes in template to speed up your development process. Checkout the list below:

Utility class name | Description | Available options
--- | --- | ---
.text-primary-hover | Set text primary color on hover to all anchor tags under `.text-primary-hover` container. | -
.font-base | Apply font family base | -
.font-heading | Apply font family heading | -
.grayscale | To apply grayscale filter on image or any section. On hover it will change back to normal | -
.rotate-# | rotate elements by using this class | `.rotate-25`
.opacity-# | Set opacity to elements by using this class | `.opacity-1 .opacity-2 .opacity-3 .opacity-4 .opacity-5 .opacity-6 .opacity-7 .opacity-8 .opacity-9`
.z-index-# | Set z-index | `.z-index-9 .z-index-99`
.z-index-n9 | Set z-index in negative | `.z-index-n9`
.fill-### | Fill utilities. You can also set different colors in elements | `.fill-primary .fill-danger .fill-warning .fill-success .fill-info .fill-orange .fill-white .fill-dark`
.w-### | Width utilities. You can also set different width in different Screen sizes by combining with Screen sizes classes`w-md-20` | `.w-20 .w-30`
.h-### | Height utilities. You can also set different height in different Screen sizes by combining with Screen sizes classes `h-md-30` | `.h-30 .h-150 .h-400 .h-600 .h-700`
.box-sm, md, lg, and xl | Set box with fixed height and width | `.box-sm .box-md .box-lg .box-xl`