diff --git a/src/ui/ActiveScripts/WorkerScriptAccordion.tsx b/src/ui/ActiveScripts/WorkerScriptAccordion.tsx
index ccc42847e..68bf7f428 100644
--- a/src/ui/ActiveScripts/WorkerScriptAccordion.tsx
+++ b/src/ui/ActiveScripts/WorkerScriptAccordion.tsx
@@ -74,7 +74,7 @@ export function WorkerScriptAccordion(props: IProps): React.ReactElement {
     <>
       <ListItemButton onClick={() => setOpen((old) => !old)} component={Paper}>
         <ListItemText primary={<Typography>└ {props.workerScript.name}</Typography>} />
-        {open ? <ExpandLess /> : <ExpandMore />}
+        {open ? <ExpandLess color="primary" /> : <ExpandMore color="primary" />}
       </ListItemButton>
       <Collapse in={open} timeout={0} unmountOnExit>
         <Box mx={6}>
diff --git a/src/ui/React/Theme.tsx b/src/ui/React/Theme.tsx
index a8196b478..65f04afa2 100644
--- a/src/ui/React/Theme.tsx
+++ b/src/ui/React/Theme.tsx
@@ -68,6 +68,7 @@ export const theme = createTheme({
       dark: colors.warningdark,
     },
     background: {
+      default: colors.black,
       paper: colors.well,
     },
   },