@media (max-width: 768px) {

    .app_title{
        font-size: 20px;
    }

    .introduce_box {
        display: block;
        height: 100px !important;
        padding-top: 30px;
    }

    .control_buttons .button_card .title{
        font-size: 13px;
    }


    .video {
        width: 100%;
        min-height: 180px;
        background-color: rgb(244 241 244 / 8%);
        border-radius: 15px;
        display: flex;
        align-items: center;
        justify-content: center;
        align-content: center;
        flex-direction: column;
        overflow: hidden;
    }

    .video #pre_video{
        object-fit: cover;
        object-position: center;
    }

    .link_box{
        height: 40px;
    }

    .link_box .link {
        line-height: 40px;
    }

    .loading_text{
        font-size: 18px;
    }

    .join_row{
        height: auto !important;
    }

    .join_container {
        justify-content: start;
    }

    .introduce {
        border-radius: 8px;
        padding: 10px 10px 10px 10px;
    }

    .introduce p {
        display: none;
    }

    .introduce ul {
        display: none;
    }

    .introduce li {
        display: none;
    }


}