.icon {
    display: inline-block;
    text-transform:none;
    line-height:1;
    vertical-align:-.125em;
    width: .95em;
    height: .95em;
    background-color: currentColor;
    mask: center / contain no-repeat;
}

.icon-child {mask-image: url("images/child.svg");}
.icon-elderly {mask-image: url("images/elderly.svg");}
.icon-people {mask-image: url("images/people.svg");}