> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Change building color based on zoom level
This example creates a customized map experience by changing the colors and opacity of buildings as the map is zoomed in.
It uses the [`setPaintProperty()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#setpaintproperty) method with the [`interpolate` expression](https://docs.mapbox.com/style-spec/reference/expressions/#interpolate) to gradually change the [`fill-color`](https://docs.mapbox.com/style-spec/reference/layers/#paint-fill-fill-color) of the `building` layer from beige to yellow and increase the [`fill-opacity`](https://docs.mapbox.com/style-spec/reference/layers/#paint-fill-fill-opacity) as the zoom level increases. This example ties the zoom behavior to a button click, but your implementation could use a different trigger.
> Example code:
**JavaScript**
```html
Change building color based on zoom level
```
**React**
```jsx
import React, { useEffect, useRef } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
mapRef.current = new mapboxgl.Map({
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
container: 'map', // container ID
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/streets-v12', // style URL
center: [-90.73414, 14.55524], // starting position [lng, lat]
zoom: 15 // starting zoom
});
mapRef.current.on('load', () => {
mapRef.current.setPaintProperty('building', 'fill-color', [
'interpolate',
// Set the exponential rate of change to 0.5
['exponential', 0.5],
['zoom'],
// When zoom is 15, buildings will be beige.
15,
'#D9D3C9',
// When zoom is 18 or higher, buildings will be yellow.
18,
'#ffd700'
]);
mapRef.current.setPaintProperty('building', 'fill-opacity', [
'interpolate',
// Set the exponential rate of change to 0.5
['exponential', 0.5],
['zoom'],
// When zoom is 10, buildings will be 100% transparent.
10,
0.5,
// When zoom is 18 or higher, buildings will be 100% opaque.
18,
1
]);
});
// When the button is clicked, zoom in to zoom level 19.
// The animation duration is 9000 milliseconds.
document.getElementById('zoom').addEventListener('click', () => {
mapRef.current.zoomTo(18, { duration: 9000 });
});
}, []);
return (