add horizontal padding to invocation graph for better scrolling

Author: ahmedhamidawan

client/src/components/Workflow/Invocation/Graph/InvocationGraph.vue

@@ -183,7 +183,7 @@ function stepClicked(nodeId: number | null) {
         <div v-else-if="steps && datatypesMapper">
             <div class="d-flex">
                 <div class="position-relative w-100">
-                    <BCard no-body>
+                    <BCard no-body :class="activeNodeId !== null && 'px-4 bg-secondary'">
                         <WorkflowGraph
                             ref="workflowGraph"
                             class="invocation-graph"