@media (max-width: 768px) {
    body {
        padding: 5px;
        width: 100vw;
        overflow-x: hidden;
    }
    .top img{
    width:20px;
    height: 20px;
    }
    
    #nav {
        z-index: 100;
       
    }
    #nav> ul> li, #nav-en li {
        width: 25% !important;
        font-size: 16px !important;
        position: relative;
        white-space: nowrap;
        
    }
   #nav li .dropdown {
        z-index: 1000;
        width: 200px;
        right: 0;
        left: auto;
        background: #01582B;
        border-radius: 0 0 10px 10px;
}
.dropdown li:hover{
    width:100%;
}
.practical_img tr{
    flex-direction: column;
    align-items: center;
}
iframe{
    width:700px;
    height: 700px;
}
.practical_img td{
    width:95%;
   
}
}