.block:nth-child(odd){background:#f0f8ff}.block img{max-width:100%}.pad-gap{padding:0 10%;max-width:1880px;margin:0 auto}@media screen and (max-width:1550px){.pad-gap{padding:0 5%}}@media screen and (max-width:1200px){.pad-gap{padding:0 1%}}