body, ul, li {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        .side-bar > ul ul {
            display: none;
        }

        body {
            height: 1500px;
            background-color: #ffff;
        }

        :root {
            --side-bar-width: 270px;
            --side-bar-height: 90vh;
        }

        .side-bar {
            position: fixed;
            background-color: black;
            width: var(--side-bar-width);
            min-height: var(--side-bar-height);
            margin-top: calc((100vh - var(--side-bar-height)) / 2);
            border-radius: 20px;
            transform: translate(calc(var(--side-bar-width) * -0.8), 0);
            transition: .5s;
        }

        .side-bar__icon-box {
            display: flex;
            justify-content: flex-end;
        }

        .side-bar__icon-1 {
            position: relative;
            width: 23px;
            height: 17px;
            margin: 15px;
            margin-top: 20px;
            transition: .5s;
        }

        :root {
            --side-bar__icon: .5s;
        }

        .side-bar__icon-1 > div {
            position: absolute;
            width: 100%;
            height: 20%;
            background-color: white;
            transition: all var(--side-bar__icon);
        }

        .side-bar__icon-1 > div:nth-of-type(1) {
            top: 0;
            width: auto;
            left: 0;
            right: 0;
            transition: all var(--side-bar__icon), left calc(var(--side-bar__icon) / 2) calc(var(--side-bar__icon) / 2), right calc(var(--side-bar__icon) / 2) calc(var(--side-bar__icon) / 2), height calc(var(--side-bar__icon) / 2) 0s;
        }

        .side-bar__icon-1 > div:nth-of-type(2) {
            top: 40%;
            transform-origin: bottom left;
        }

        .side-bar__icon-1 > div:nth-of-type(3) {
            top: 80%;
            left: auto;
            right: 0;
            transform-origin: bottom right;
        }

        .side-bar:hover .side-bar__icon-1 {
            transform: translate(-198px, 0);
        }

        .side-bar:hover .side-bar__icon-1 > div:nth-of-type(2) {
            transform: rotate(45deg);
            width: 70.5%;
            height: 25%;
        }

        .side-bar:hover .side-bar__icon-1 > div:nth-of-type(3) {
            top: 40%;
            transform: rotate(-45deg);
            width: 70.5%;
            height: 25%;
        }

        .side-bar:hover .side-bar__icon-1 > div:nth-of-type(1) {
            left: 41%;
            right: 41%;
            height: 100%;
            transition: all var(--side-bar__icon), left calc(var(--side-bar__icon) / 2) 0s, right calc(var(--side-bar__icon) / 2) 0s, height calc(var(--side-bar__icon) / 2) calc(var(--side-bar__icon) / 2);
        }

        .side-bar ul > li > a {
            display: block;
            color: white;
            font-size: 1.2rem;
            padding-top: 20px;
            padding-bottom: 5px;
            padding-left: 50px;
            transition: .5s;
        }

        .side-bar > ul > li {
            position: relative;
        }

        .side-bar ul > li:hover > a {
            background-color: #555;
            border-bottom: 1px solid #999;
        }

        .side-bar > ul > li:hover > ul {
            display: block;
            position: absolute;
            background-color: #888;
            top: 0;
            left: 100%;
            width: 100%;
        }

        .side-bar:hover {
            transform: translate(-20px, 0);
        }

        .content-box {
            margin-left: calc(var(--side-bar-width) / 4);
            padding: 20px;
            font-size: 1.5rem;
            font-weight: bold;
            background-color: #ffff;
            border-radius: 10px;
            width: 100%;
            min-height: 70vh;
        }
    
/* Manual ads stay in normal document flow; their height remains fluid. */
.page-ad {
    clear: both;
    box-sizing: border-box;
    width: min(1000px, calc(100vw - 108px));
    margin: 48px 0;
    padding: 16px 0;
    border-top: 1px solid #e5e7eb;
    border-bottom: 1px solid #e5e7eb;
    font-weight: normal;
}
.page-ad-label {
    margin: 0 0 12px;
    color: #666;
    font: 12px/1.4 Arial, sans-serif;
    text-align: center;
}
@media (max-width: 600px) {
    .page-ad {
        width: calc(100vw - 40px);
        margin-left: calc(var(--side-bar-width) / -4);
    }
}