Change container selector for padding calculation

Use js-pipeline-container for alignment to container
Remove css side padding from pipeline tab content
Accounting for right padding no longer needed

app/assets/javascripts/pipelines/components/graph/graph_component.vue

@@ -42,14 +42,11 @@ export default {
   },
   methods: {
     setGraphPadding() {
-      const container = document.querySelector('.content .container-limited');
+      const container = document.querySelector('.js-pipeline-container');
       if (!container) return;
 
-      const containerRightPadding = 16;
-
       this.graphLeftPadding = container.offsetLeft;
-      this.graphRightPadding =
-        window.innerWidth - container.offsetLeft - container.offsetWidth + containerRightPadding;
+      this.graphRightPadding = window.innerWidth - container.offsetLeft - container.offsetWidth;
     },
     handleLayoutChange() {
       // wait until animations finish, then recalculate padding

app/assets/stylesheets/pages/pipelines.scss

@@ -449,7 +449,7 @@
   display: flex;
   width: 100%;
   background-color: $gray-light;
-  padding: $gl-padding;
+  padding: $gl-padding 0;
   overflow: auto;
 }