/*Smallest Unit*/
.space {
    height: 12px;
}

/*2 Spaces*/
.small {
    height: 24px;
}

/*2 smalls + 2 space*/
.medium {
    height: 72px;
}

/*1 medium + 2 smalls*/
.large {
    height: 120px;
}

/*1 large + 2 mediums*/
.xlarge {
    height: 264px;
}