body {
    margin: 0;
    background-color: black;
    color: white;
    font-family: Helvetica, sans-serif;
}
.container {
    display: flex;
    height: 100vh;
}
.toc {
    width: 200px;
    background-color: black;
    padding: 20px;
    border-right: 1px solid #222;
}
.toc ul {
    list-style: none;
    padding: 0;
}
.toc li {
    cursor: pointer;
    margin-bottom: 10px;
    color: #888;
}
.toc li:hover {
    color: cyan;
}
.carousel {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.carousel img {
    max-width: 90%;
    max-height: 90%;
    border: none;
}
.arrow {
    position: absolute;
    top: 50%;
    font-size: 30px;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    z-index: 2;
}
.arrow.left {
    left: 10px;
}
.arrow.right {
    right: 10px;
}