Fix game viewport layout

index.html

@@ -58,6 +58,7 @@
           <div><kbd>WASD</kbd><kbd>Arrow</kbd><span>Move</span></div>
           <div><kbd>Space</kbd><span>Fire</span></div>
           <div><kbd>P</kbd><span>Pause</span></div>
+          <div><kbd>Esc</kbd><span>End</span></div>
           <div><kbd>Enter</kbd><span>Start / Restart</span></div>
         </footer>
       </section>

src/styles.css

@@ -73,7 +73,7 @@ button:focus-visible {
 }
 
 .shell {
-  width: min(1180px, calc(100vw - 32px));
+  width: min(980px, calc(100vw - 32px));
   min-height: 100vh;
   margin: 0 auto;
   padding: 18px 0;
@@ -192,7 +192,7 @@ h1 {
 
 .stage-wrap {
   position: relative;
-  width: min(100%, max(420px, calc((100vh - 320px) * 4 / 3)));
+  width: 100%;
   aspect-ratio: 4 / 3;
   margin: 0 auto;
   min-height: 280px;
@@ -319,7 +319,6 @@ kbd {
   }
 
   .stage-wrap {
-    width: 100%;
     max-height: none;
   }
 }