Remove unnecessary padding around game field

package.json

@@ -1,6 +1,6 @@
 {
     "name": "minesweeper",
-    "version": "0.82.11",
+    "version": "0.82.12",
     "description": "Just Minesweeper!",
     "author": "F.W. Dekker",
     "browser": "dist/bundle.js",

src/main/css/main.css

@@ -1,8 +1,3 @@
-#mainContainer {
-    max-width: 100%;
-    padding: 6rem;
-}
-
 form {
     display: inline;
 }

src/main/index.html

@@ -33,7 +33,7 @@
     <div id="contents">
         <div id="header"></div>
 
-        <section class="container" id="mainContainer">
+        <section class="container">
             <!-- Controls -->
             <div class="row controls">
                 <div class="column">