.game_page {
                grid-column: 2;
            }

            details {
                width: 640px;
                background-color: #8e8e8e;
                border: 1px solid black;
                margin: 0 auto;
                border-radius: 0;
            }

            details[open] {
                border-radius: 0;
                border-bottom-left-radius: 16px;
                border-bottom-right-radius: 16px;
            }

            details[open] > summary {
                border-bottom: 1px dotted black;
            }

            details > summary {
                padding: 8pt;
                cursor: pointer;
                vertical-align: middle;
            }

            details p {
                margin: 0;
                padding: 8pt;
                padding-left: 20pt;
                background-color: #bbbbbb;
            }

            details p:last-child {
                border-radius: 0;
                border-bottom-left-radius: 16px;
                border-bottom-right-radius: 16px;
            }

            details p:nth-child(even) {
                background-color: #cccccc;
            }

            nav {
                display: flex;
                justify-content: center;
                align-items: center;
                flex-wrap: nowrap;
            }

            nav a {
                margin: 0 8px;
                padding: 8px;
                text-decoration: none;
                font-weight: bold;
            }

            nav a:link {
                color: red;
            }

            nav a:visited {
                color: red;
            }

            .gm4html5_div_class {
                width: 640px;
                margin: 0 auto;
                margin-bottom: 0;
                padding: 0;
                border: 0;
            }

            h1 {
                color: #cccccc;
                margin: 8px auto;
                text-align: center;
            }

            article {
                width: auto;
            }