Update css

css/style.css

@@ -100,6 +100,7 @@ main {
 
 #checkbox {
     display: none;
+    cursor: pointer;
 }
 
 #checkbox:checked+#formcontainer #form {
@@ -234,3 +235,8 @@ main {
     width: 5em;
     background-color: #7e2722;
 }
+
+#form_button:hover {
+    color: #ffffff;
+    cursor: pointer;
+}

index.html

@@ -19,7 +19,7 @@
             <input type="checkbox" id="checkbox">
             <div id="formcontainer">
                 <form id="form" action="game.html">
-                    <input id="form_input" placeholder="Pseudo" type="text" pattern="[\ A-Za-z0-9]{1,20}" required>
+                    <input id="form_input" placeholder="Pseudo" type="text" pattern="[A-Za-z0-9]{1,20}" required>
                     <label id="form_buttonLabel" for="checkbox">
                         <button id="form_button" type="submit">Go!</button>
                     </label>