Make the editor use the remaining page height

src/style.css

@@ -24,10 +24,13 @@ h1 {
 }
 
 #app {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
+
+#app[hidden] {
+  display: none;
 }
 
 .input {
@@ -36,6 +39,9 @@ h1 {
   justify-content: center;
   margin-bottom: 0.5em;
 }
+.current-word {
+  padding-top: 2rem;
+}
 input {
   padding: 0.3em 0.5em;
   font-size: 1.1em;
@@ -108,9 +114,8 @@ button:focus-visible {
   background-color: #3a3a3a;
 }
 
-graph-editor {
-  display: block;
-  height: 600px;
+#state-graph {
+  flex-grow: 1;
 }
 
 .link {