Minor style fixes

- fixed back to lobby button
- fixed chat background

public/javascripts/bingo-web.js

@@ -166,6 +166,7 @@ async function setLobbyWords(words) {
  * @returns {Promise<void>}
  */
 async function startRound() {
+    let textinput = document.querySelector('#input-bingo-words');
     let words = getLobbyWords();
     let resultWords = await setLobbyWords(words);
     textinput.value = resultWords.map(x => x.content).join('\n');

public/stylesheets/sass/bingo/style.sass

@@ -17,10 +17,15 @@
   vertical-align: middle
   padding: 1rem
   z-index: 1000
+  grid-template: 60% 40% / 100%
+
+  h1
+    @include gridPosition(1, 2, 1, 1)
 
   button
     margin: 1rem
     font-size: 2rem
+    @include  gridPosition(2, 3, 1, 1)
 
 .greyover
   width: 100%
@@ -59,7 +64,7 @@
   height: calc(100% - 2px)
   #chat-content
     height: calc(100% - 3rem)
-    width: 100%
+    width: calc(100% - 2px)
     overflow-y: auto
     border: 1px solid $inactive
     box-shadow: inset 0 0 1rem $primary