@media (max-width: 991px){
.susutain {
    height: auto;
}
.tab button{
    font-size: 16px;
    padding: 10px;
}
.piyu{
    height: auto;
}
.sub-ordinate{
    display: block;
}
}

@media (max-width: 768px) {

    .tab{
        width: 100%;
        height: auto;
        margin-bottom: 20px;
    }
    .tabcontent{
        width: 100%;
    }

}