That tool involves using a JS library and looks overly complicated to me.
An alternative is to drag your svg image into Chrome, then view the page source to see the svg code. You can copy that and paste it anywhere you like. You’ll see some fill colors in the code that you can play with too if you want to change them.
Alternatively if you have the option, it is much easier to just place svg files directly into the browser and it will work in any modern browser. You would simply add like it were an image <img src=“demo.svg”> Then style it (width, height etc) with CSS.