@media(max-width: 419px){header .site-logo {height: auto;max-width: 210 px;margin-top: 23 px;}} @media (min-width: 420px)和(max-width: 619px) {header .site-logo {height:auto;max-width: 280 px;}} @media (min-width: 620px)和(max-width: 950px) {header .site-logo {height:auto;max-width: 490 px;}} .main-banner-txt{显示:none;｝