body{
    background-color: #eee;
}

#manyi_body {
    width: max(90%,768px);
    margin: auto;
}

@media (max-width: 768px) {
    #manyi_body {
        width: 97vw;
    }
}

.manyi_card {
    margin: 20px 7px;
    padding: 15px;
    box-sizing: border-box;
}