.container {
    display: flex;
    flex-direction: column;
}


/* 仅移动端 fixed */
@media screen and (max-width: 768px) {
    .content-png-box {
        padding: 10px 10px 120px 10px;
    }
    .footer-png-box {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 100;
    }

}

@media screen and (min-width: 768px) {
    .container {
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    }
    .content-png-box {
        padding: 10px 10px 150px 10px;
    }
    .footer-png-box {
        position: fixed;
        left: 50%;
        transform: translateX(-50%);
        bottom: 0;
        z-index: 100;
        width: 600px;
    }
}