nav {
    display: flex;
    justify-content: space-around;
    width: 100%;
    height: fit-content;
    padding: 0.5rem 0;
    background-color: #fff;
    text-align: center;
    border-width: 1px 0;
    border-style: solid;
    border-color: black;
}
nav * {
    font-size: 0.8rem;
}
nav ol {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    width: fit-content;
    margin: 0;
    padding: 0;
}
nav ol li {
    display: inline-block;
    width: 3rem;
    background: #fff;
    font-weight: bold;
    user-select: none;
}
nav ol li:first-child {
    padding-left: 1rem;
    text-align: left;
    clip-path: polygon(0% 0%,0% 100%,80% 100%,100% 50%,80% 0%);
}
nav ol li:not(:last-child,:first-child) {
    text-align: center;
    clip-path: polygon(0% 0%,20% 50%,0% 100%,80% 100%,100% 50%,80% 0%);
}
nav ol li:last-child {
    padding-right: 1rem;
    text-align: right;
    clip-path: polygon(0% 0%,20% 50%,0% 100%,100% 100%,100% 0);
}
nav ol li.done {
    background: var(--nav-li-done-background);
}
nav ol li.current {
    background: var(--nav-li-current-background);
}