Add one of the following classes to resize an avatar group.
.avatar-size-1
.avatar-size-2
.avatar-size-3
.avatar-size-4
.avatar-size-5
.avatar-size-6
<div class="avatar-group avatar-size-1">
<img class="img-circle" src="https://placehold.it/100/111/fff">
<img class="img-circle" src="https://placehold.it/100/777/fff">
</div>
<div class="avatar-group avatar-size-2">
<img class="img-circle" src="https://placehold.it/100/111/fff">
<img class="img-circle" src="https://placehold.it/100/777/fff">
</div>
<div class="avatar-group avatar-size-3">
<img class="img-circle" src="https://placehold.it/100/111/fff">
<img class="img-circle" src="https://placehold.it/100/777/fff">
</div>
<div class="avatar-group avatar-size-4">
<img class="img-circle" src="https://placehold.it/100/111/fff">
<img class="img-circle" src="https://placehold.it/100/777/fff">
</div>
<div class="avatar-group avatar-size-5">
<img class="img-circle" src="https://placehold.it/100/111/fff">
<img class="img-circle" src="https://placehold.it/100/777/fff">
</div>
<div class="avatar-group avatar-size-6">
<img class="img-circle" src="https://placehold.it/100/111/fff">
<img class="img-circle" src="https://placehold.it/100/777/fff">
</div>