how to change drawing tool color google map

1// This example requires the Drawing library. Include the libraries=drawing
2// parameter when you first load the API. For example:
3// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=drawing">
4function initMap() {
5  const map = new google.maps.Map(document.getElementById("map"), {
6    center: { lat: -34.397, lng: 150.644 },
7    zoom: 8
8  });
9  const drawingManager = new google.maps.drawing.DrawingManager({
10    drawingMode: google.maps.drawing.OverlayType.MARKER,
11    drawingControl: true,
12    drawingControlOptions: {
13      position: google.maps.ControlPosition.TOP_CENTER,
14      drawingModes: [
15        google.maps.drawing.OverlayType.MARKER,
16        google.maps.drawing.OverlayType.CIRCLE,
17        google.maps.drawing.OverlayType.POLYGON,
18        google.maps.drawing.OverlayType.POLYLINE,
19        google.maps.drawing.OverlayType.RECTANGLE
20      ]
21    },
22    markerOptions: {
23      icon:
24        "https://developers.google.com/maps/documentation/javascript/examples/full/images/beachflag.png"
25    },
26    circleOptions: {
27      fillColor: "#ffff00",
28      fillOpacity: 1,
29      strokeWeight: 5,
30      clickable: false,
31      editable: true,
32      zIndex: 1
33    }
34  });
35  drawingManager.setMap(map);
36}