header {
    background-color: white;
    box-shadow: 0px 1px 8px 0px rgba(0,0,0,0.12),0px 1px 0px 0px rgba(232,232,232,1);

    box-sizing: border-box;
    height: 8vh;
    padding: 0em 1em;

    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 0.5em;

    z-index: 999;
    position: sticky;
    top: 0;
}

.header-nav {
    flex: 1;
    height: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}
.nav-menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
}
.nav-menu li,
.nav-menu-item,
.nav-sub-menu li,
.nav-sub-menu-item {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}
.nav-sub-menu li,
.nav-sub-menu-item {
    border-top: 1px solid rgba(200, 200, 200, 0.5);
}

.nav-sub-menu {
    display: none;
    flex-direction: column;
    position: absolute;

    background-color: white;
    top: 4em;
    left: 0;
    width: 200%;
}
.nav-menu li:hover .nav-sub-menu,
.nav-menu-item:hover .nav-sub-menu {
    display: flex;
}


footer {
    width: 100%;
    color: white;
    background-color: rgb(14, 27, 45);

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}