Add rules.ecr and change background image.

public/css/main.css

@@ -70,6 +70,7 @@ div.top-bar {
   padding: 20px;
   max-width: 500px;
   margin: auto;
+  margin-top: 20px;
   border-radius: 10px; }
 
 .black-player .board-cell:hover .overlay {

public/css/style.css

@@ -2,6 +2,7 @@ body {
     font-family: Roboto;
     background-image: url(/images/clouds.jpg);
     background-color: #F5F7FA;
+    background-size: cover;
     color: #2d2d2d;
 }
 

public/scss/main.scss

@@ -90,6 +90,7 @@ div.top-bar {
     padding: 20px;
     max-width: 500px;
     margin: auto;
+    margin-top: 20px;
     border-radius: 10px;
 }