recover textBtn color

Signed-off-by: ryjiang <jiangruiyi@gmail.com>

client/src/components/customButton/CustomButton.tsx

@@ -7,6 +7,7 @@ const buttonStyle = makeStyles(theme => ({
     fontWeight: 'bold',
   },
   textBtn: {
+    color: theme.palette.primary.main,
     padding: theme.spacing(1),
 
     '&:hover': {