Fix a bunch of layout issues

website/src/ui/Dimmer.js

@@ -6,7 +6,8 @@ import { reactAutoBind } from 'auto-bind2'
 
 export class Dimmer extends Component {
   static propTypes = {
-    children: PropTypes.node
+    children: PropTypes.node,
+    active: PropTypes.bool
   }
 
   constructor(props) {
@@ -19,11 +20,11 @@ export class Dimmer extends Component {
   }
 
   render() {
-    return (
+    return this.props.active ? (
       <div style={style.dimmer} onClick={this.preventPropagation}>
         {this.props.children}
       </div>
-    )
+    ) : null
   }
 }