starting game planning

assets/main.rcss

@@ -2,6 +2,8 @@ body {
     font-family: rmlui-debugger-font;
     font-size: 16px;
     color: white;
+    width: 100vw;
+    height: 100vh;
 }
 
 #panel {
@@ -24,7 +26,11 @@ p {
     margin-bottom: 15px;
 }
 
-#start-btn {
+.hidden {
+    display: none;
+}
+
+.menu-btn {
     display: block;
     width: 100px;
     padding: 8px;
@@ -34,6 +40,6 @@ p {
     border: 1px #5a8ec5;
 }
 
-#start-btn:hover {
+.menu-btn:hover {
     background-color: #4a7eb5;
 }