diff --git a/observe_bact.html b/observe_bact.html
index 48a95ab..7247126 100644
--- a/observe_bact.html
+++ b/observe_bact.html
@@ -720,6 +720,11 @@
           // Find contours
           cv.findContours(dst, contours, hierarchy, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_SIMPLE);
           // iterate over contours
+          let contoursColor = new cv.Scalar(0, 0, 255,255);
+
+          cv.drawContours(draw, contours, -1, contoursColor, 1 );
+          cv.drawContours(src, contours, -1, contoursColor, 1 );
+
           for (let i = 0; i < contours.size(); ++i) {
             //get contour
             let cnt = contours.get(i);