diff --git a/src/app/components/pab-profile-graph/pab-profile-graph.component.ts b/src/app/components/pab-profile-graph/pab-profile-graph.component.ts
index 4e6bc423852cb9fa56fd757e2d59054fda82dc53..a6689110f4804d3782793e66a5707f2783fb7585 100644
--- a/src/app/components/pab-profile-graph/pab-profile-graph.component.ts
+++ b/src/app/components/pab-profile-graph/pab-profile-graph.component.ts
@@ -97,7 +97,11 @@ export class PabProfileGraphComponent extends ResultsComponent {
                 },
                 zoom: {
                     enabled: true,
-                    drag: true, // conflicts with pan; set to false to enable mouse wheel zoom
+                    drag: { // conflicts with pan; set to false to enable mouse wheel zoom,
+                        borderColor: "rgba(225,225,225,0.3)",
+                        borderWidth: 1,
+                        backgroundColor: "rgba(0,0,0,0.25)"
+                    },
                     mode: "xy",
                     // percentage of zoom on a wheel event
                     // speed: 0.1,
diff --git a/src/app/components/results-graph/results-graph.component.ts b/src/app/components/results-graph/results-graph.component.ts
index abda1f85a7f479a5189ca28114d2c81b37d21c02..0edf3e57c99ed46506e76d4c8f9e9b97db46f811 100644
--- a/src/app/components/results-graph/results-graph.component.ts
+++ b/src/app/components/results-graph/results-graph.component.ts
@@ -74,7 +74,11 @@ export class ResultsGraphComponent extends ResultsComponent implements AfterCont
                 },
                 zoom: {
                     enabled: true,
-                    drag: true, // conflicts with pan; set to false to enable mouse wheel zoom
+                    drag: { // conflicts with pan; set to false to enable mouse wheel zoom,
+                        borderColor: "rgba(225,225,225,0.3)",
+                        borderWidth: 1,
+                        backgroundColor: "rgba(0,0,0,0.25)"
+                    },
                     mode: "xy",
                     // percentage of zoom on a wheel event
                     // speed: 0.1,