body {
            width: fit-content;
            font-family:
                "Cambria Math",
                "Latin Modern Math",
                "STIX Two Math",
                "SimSun", "宋体",
                "Times New Roman", Times, serif;
            font-size: 1.8vw;
        }

        .返回 {
            position: fixed;
            margin: 10vh auto auto 2vw;
        }

        .主框 {
            width: fit-content;
            margin: 10vh auto auto 10vw;
        }

        .主框 p {
            width: fit-content;
            margin: 0 auto 4vh 0;
            white-space: nowrap;
        }