nav-bar.css

:target {
    scroll-margin-top: calc(50px + 1rem);
}
.nav-bar {
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    right: 0;
    height: 50px;
    background-color: #034C6B;
}
.nav-bar .img-link {
    margin-left: 0.5rem;
}
.nav-bar img {
    height: 90%;
    box-shadow: none;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
    padding-top: 3px;
}
.nav-bar .nav-items li a {
    color: white;
    display: block;
    padding: 10px 20px;
    text-decoration: none;
}
.nav-bar ul {
    margin: 0;
    padding: 0;
    list-style: none;
    overflow: hidden;
    background-color: #034C6B;
}
.nav-bar .nav-items {
    clear: both;
    max-height: 0;
    transition: max-height .2s ease-out;
}
.nav-bar .menu-icon {
    cursor: pointer;
    float: right;
    padding: 12px 20px;
    position: relative;
    user-select: none;
    font-size: 1.5rem;
    color: #fff
}
.nav-bar #menu-btn {
    display: none;
}

.nav-bar #menu-btn:checked ~ .nav-items {
    max-height: 240px;
}

/* 48em = 768px */

@media (min-width: 48em) {
    .nav-bar li {
      float: left;
    }
    .nav-bar .nav-items {
      clear: none;
      float: right;
      max-height: none;
    }
    .nav-bar .menu-icon {
      display: none;
    }
}

body {
    height: 100%;
}
.tocSwitch {
    position: fixed;
    top: 55px;
    right: 5px;
    text-decoration: none;
    font-size: 1.5rem;
    z-index: 1001;
}
@media screen and (min-width: 768px) {
    .tocSwitch {
        display: none;
    }
    #toc {
        display: block !important;
        padding-top: 50px !important;
    }
}
@media screen and (max-width: 768px) {
    body #header #toc {
        position: fixed;
        background-color: rgba(255, 255, 255);
        z-index: 1000;
        top: 50px;
        width: 100%;
        margin-top: 0 !important;
        overflow-y: auto;
        bottom: 0;
    }
}