.css_1{background-color:#f1f3f5;} @media screen and (max-width:1500px) {.css_1_p{background-color:#f1f3f5;}} @media screen and (max-width:1100px) {.css_1_t{background-color:#f1f3f5;}} @media screen and (max-width:700px) {.css_1_m{background-color:#f1f3f5;}}