Fix #16 - background size

Add width/height to body and make sure background size is set to cover

public/css/style.css

@@ -9,6 +9,9 @@ margin:0;
 padding:0;
 font-family: 'Lato', sans-serif;
 background: #fff url(../images/bg.jpg) center top no-repeat;
+background-size: cover;
+height: 100%;
+width: 100%;
 }