update styling for loading icon

app/assets/javascripts/vue_pipelines_index/pipelines.js.es6

@@ -72,7 +72,7 @@
     },
     template: `
       <div>
-        <div class="pipeline-loading-status" v-if='pipelines.length < 1'>
+        <div class="pipelines realtime-loading" v-if='pipelines.length < 1'>
           <i class="fa fa-spinner fa-spin"></i>
         </div>
         <div class="table-holder" v-if='pipelines.length > 0'>
@@ -104,7 +104,7 @@
             </tbody>
           </table>
         </div>
-        <div class="pipeline-loading-status" v-if='pageRequest'>
+        <div class="pipelines realtime-loading" v-if='pageRequest'>
           <i class="fa fa-spinner fa-spin"></i>
         </div>
         <gl-pagination

app/assets/stylesheets/pages/pipelines.scss

 .pipelines {
+  .realtime-loading {
+    font-size: 40px;
+    text-align: center;
+  }
+
   .stage {
     max-width: 90px;
     width: 90px;