Control the opacity of elements.
The opacity property sets the opacity level for an element. The opacity level describes the transparency level, where 1 is not transparent at all, .5 is 50% visible, and 0 is completely transparent.
opacity
1
.5
0
<!-- Opacity --> <div class="opacity-100">...</div> <div class="opacity-75">...</div> <div class="opacity-50">...</div> <div class="opacity-25">...</div>