game-card: banner size shouldn't be huge

Author: Mstrodl

src/static/css/devcade.css

@@ -251,6 +251,7 @@ img.header {
   height: 200px;
   padding: 0.5em 5px;
   border-radius: 10px;
+  background-size: cover;
 }
 
 .game-icon {
@@ -407,4 +408,4 @@ a:hover {
     display: flex !important;
     width: unset;
   }
-}
+}