header {
            background-color: #6e6b6b;
            padding: 20px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        h1 {
            margin: 0;
            font-size: 28px;
            font-weight: normal;
            color: #fff;
        }
        main {
            max-width: 800px;
            margin: 20px auto;
            padding: 20px;
            background-color: #fff;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        h2 {
            font-size: 24px;
            margin-top: 20px;
            color: #333;
        }
        p {
            line-height: 1.5;
            margin: 10px 0;
            color: #666;
        }
        img {
            max-width: 100%;
            height: auto;
            margin: 20px 0;
        }
        ul {
            margin: 0;
            padding: 0;
            list-style: none;
            color: #666;
        }
        li {
            margin-left: 20px;
            position: relative;
        }
        li:before {
            content: "";
            position: absolute;
            top: 0;
            left: -10px;
            border-left: 1px solid #ccc;
            height: 100%;
        }
        li:first-child:before {
            top: 20px;
            height: calc(100% - 20px);
        }
        ul ul {
            margin-top: 20px;
        }
        ul ul:before {
            content: "";
            position: absolute;
            top: 0;
            left: -10px;
            border-left: 1px solid #ccc;
            height: 100%;
        }
        ul ul:first-child:before {
            top: 20px;
            height: calc(100% - 20px);
        }
        .note {
            background-color: #f2f2f2;
            padding: 10px;
            border-left: 5px solid #ccc;
            margin: 20px 0;
        }
        .note p {
            margin: 0;
            color: #333;
        }

        a {
            color: #b9b9b9;
            text-decoration: none;