Opacity

Opacity of elements.

Css Class	Value
.o-10	0.1
.o-20	0.2
.o-30	0.3
.o-40	0.4
.o-50	0.5
.o-60	0.6
.o-70	0.7
.o-80	0.8
.o-90	0.9
.o-100	1

     <div class="display-i-b bg-purple text-white o-10 mt-3 mr-3 p-2">
        opacity 10
      </div>
      <div class="display-i-b bg-purple text-white o-30 mt-3 mr-3 p-2">
        opacity 30
      </div>
      <div class="display-i-b bg-purple text-white o-50 mt-3 mr-3 p-2">
        opacity 50
      </div>
      <div class="display-i-b bg-purple text-white o-70 mt-3 mr-3 p-2">
        opacity 70
      </div>
      <div class="display-i-b bg-purple text-white o-90 mt-3 mr-3 p-2">
        opacity 90
      </div>