.mid {
    position: relative;
}
.mid::before {
    position: absolute;
    content: '.';
    top: -15px;
    left: 50%;
    margin-left: -2px;
    width: 3px;
    height: 3px;
}

.high{
    position: relative;
}
.high::before {
    position: absolute;
    content: '..';
    top: -10px;
    left: 14px;
    width: 1px;
    height: 3px;
    transform: rotate(90deg);
}