.box-shadow
box-shadow: 0 0 30px -10px black
.box-shadow-sm
box-shadow: 0 0 20px -10px black
.text-shadow
text-shadow: 0 0 20px black
.drop-shadow
filter: drop-shadow( 0 0 20px black )
.box-shadow
box-shadow: 0 0 30px -10px black
.box-shadow-sm
box-shadow: 0 0 20px -10px black
.text-shadow
text-shadow: 0 0 20px black
.drop-shadow
filter: drop-shadow( 0 0 20px black )