I can't change the color of the grids in Chart.js

I’m using Chartjs and I’m having problems with some properties, the page can be toggled in dark and light mode with a switch. I found how to change the color of the texts to be seen in dark mode with ‘Chart.defaults.global.defaultFontColor’ and it works fine, but when I try to change the color of the grids with ‘Chart.defaults.scale.gridLines.color’ it doesn’t work, and no matter if I use ‘Chart.defaults.scale.gridLines.display = false’ or another grid’s property, the lines don’t change.

The grid does not change

I downloaded the Chart.js’ js file and put it in the same folder as the project folder:

<script type="text/javascript" src="js/functions.js"></script>
<script type="text/javascript" src="js/Chart.min.js"></script>

The chart I am using is the same as in the documentation: https://www.chartjs.org/docs/latest/getting-started/

This is the function associated with the switch:

function changeTheme() {
    var checkbox = document.getElementById('switch');
    if (checkbox.checked == true) {
        document.documentElement.setAttribute('data-theme', 'dark');
        localStorage.setItem('data-theme', 'dark');

        Chart.defaults.global.defaultFontColor = 'rgba(255,255,255,1)'; //This works fine
        Chart.defaults.scale.gridLines.color = 'rgba(255,255,255,1)'; //The line that should change the grid color

    }
    else {
        document.documentElement.setAttribute('data-theme', 'light');
        localStorage.setItem('data-theme', 'light');

        Chart.defaults.global.defaultFontColor = 'rgba(0,0,0,1)'; //This works fine
        Chart.defaults.scale.gridLines.color = 'rgba(0,0,0,1)'; //The line that should change the grid color

    }
    Chart.helpers.each(Chart.instances, function (instance) {
        instance.chart.update();
    });

    console.log(Chart);
}

Edit:
I checked that the gridLines.color property does exist, and changes its value, but the chart is still not affected.
Properties

Thanks!

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