Use the .align-content-*-around classes to align gathered items "around" on different screens.
.align-content-around:
.align-content-around
.align-content-sm-around:
.align-content-sm-around
.align-content-md-around:
.align-content-md-around
.align-content-lg-around:
.align-content-lg-around
.align-content-xl-around:
.align-content-xl-around