.icon {
    width: 24px;
    height: 24px;
    display: inline-block;
    color: darkblue;
    vertical-align: middle;
}

.icon-lg {
    width: 30px;
    height: 30px;
}

.icon-xl {
    width: 40px;
    height: 40px;
}

.icon-sm {
    width: 16px;
    height: 16px;
}

.icon-grey {
    color: grey;
}