.photo-grid{columns:2;column-gap:10px}img{width:100%;height:auto;margin-bottom:10px}@media screen and (width>=576px){.photo-grid{columns:3;background-color:red}}@media screen and (width>=768px){.photo-grid{columns:3;background-color:beige}}@media screen and (width>=992px){.photo-grid{columns:4;background-color:silver}}@media screen and (width>=1200px){.photo-grid{background-color:green}}@media screen and (width>=1400px){.photo-grid{background-color:#ff0}}*{box-sizing:border-box;margin:0;padding:0}body{max-width:90%;margin:auto}a{color:inherit;text-decoration:none}ul{justify-content:center;align-items:center;gap:10px;list-style-type:none;display:flex}