diff --git a/.changeset/rude-roses-jam.md b/.changeset/rude-roses-jam.md
index 3e594fad40..bd8ee1399f 100644
--- a/.changeset/rude-roses-jam.md
+++ b/.changeset/rude-roses-jam.md
@@ -1,5 +1,6 @@
 ---
-'@backstage/plugin-splunk-on-call': major
+'@backstage/plugin-splunk-on-call': minor
 ---
 
 Updated splunk-on-call plugin to use the REST endpoint (incident creation-acknowledgement-resolution).
+It implies switching from `splunkOnCall.username` annotation to `splunkOnCall.eventsRestEndpoint` annotation, this is a breaking change.
diff --git a/plugins/splunk-on-call/src/components/Escalation/EscalationPolicy.tsx b/plugins/splunk-on-call/src/components/Escalation/EscalationPolicy.tsx
index 4234ba1621..fb7061437f 100644
--- a/plugins/splunk-on-call/src/components/Escalation/EscalationPolicy.tsx
+++ b/plugins/splunk-on-call/src/components/Escalation/EscalationPolicy.tsx
@@ -37,7 +37,7 @@ const useStyles = makeStyles((theme: Theme) =>
       overflow: 'auto',
     },
     subheader: {
-      backgroundColor: 'white',
+      backgroundColor: theme.palette.background.paper,
     },
     progress: {
       margin: `0 ${theme.spacing(2)}px`,
diff --git a/plugins/splunk-on-call/src/components/Incident/Incidents.tsx b/plugins/splunk-on-call/src/components/Incident/Incidents.tsx
index 189367542d..e705152d73 100644
--- a/plugins/splunk-on-call/src/components/Incident/Incidents.tsx
+++ b/plugins/splunk-on-call/src/components/Incident/Incidents.tsx
@@ -36,7 +36,7 @@ const useStyles = makeStyles((theme: Theme) =>
       overflow: 'auto',
     },
     subheader: {
-      backgroundColor: 'white',
+      backgroundColor: theme.palette.background.paper,
     },
     progress: {
       margin: `0 ${theme.spacing(2)}px`,