Grid stuff, I think?

mdn-css-layout/grids/0-starting-point.html

@@ -18,6 +18,14 @@
         background-color: rgb(207,232,220);
         border: 2px solid rgb(79,185,227);
       }
+
+      .container {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+        grid-auto-rows: minmax(100px, auto);
+        grid-gap: 20px;
+        gap: 20px;
+      }
     </style>
   </head>
 
@@ -35,5 +43,4 @@
     </div>
 
   </body>
-
 </html>