UX: Better style for back button

app/assets/javascripts/discourse/templates/components/topic-progress.hbs

@@ -1,6 +1,6 @@
 {{#if showBackButton}}
   <div class='progress-back-container'>
-    {{d-button label="topic.timeline.back" class="btn-primary progress-back" action="goBack"}}
+    {{d-button label="topic.timeline.back" class="btn-primary progress-back" action="goBack" icon="arrow-down"}}
   </div>
 {{/if}}
 

app/assets/javascripts/discourse/widgets/topic-timeline.js.es6

@@ -18,7 +18,6 @@ function attachBackButton(widget) {
     className: 'btn btn-primary btn-small back-button',
     label: 'topic.timeline.back',
     title: 'topic.timeline.back_description',
-    icon: 'arrow-down',
     action: 'goBack'
   });
 }

app/assets/stylesheets/common/base/topic.scss

@@ -1,10 +1,9 @@
 .progress-back-container {
   position: fixed;
-  width: 0;
   right: 0;
   bottom: 40px;
   z-index: 950;
-  margin-right: 105px;
+  margin-right: 45px;
 
   .btn {
     margin: 0;