Opacity
The opacity property sets the opacity level for an element.
                            | Class | Properties | 
|---|---|
| opacity-15 | opacity: .15 | 
| opacity-20 | opacity: .2 | 
| opacity-25 | opacity: .25 | 
| opacity-30 | opacity: .3 | 
| opacity-35 | opacity: .35 | 
| opacity-40 | opacity: .4 | 
| opacity-45 | opacity: .45 | 
| opacity-50 | opacity: .5 | 
| opacity-55 | opacity: .55 | 
| opacity-60 | opacity: .6 | 
| opacity-65 | opacity: .65 | 
| opacity-70 | opacity: .7 | 
| opacity-75 | opacity: .75 | 
| opacity-80 | opacity: .8 | 
| opacity-85 | opacity: .85 | 
| opacity-90 | opacity: .90 | 
| opacity-95 | opacity: .95 | 
| opacity-100 | opacity: 1 | 
            utilities.scss API