- https://stackoverflow.com/questions/13896685/html5-slider-with-onchange-function
- this showed me how to get the value of the slider
- https://stackoverflow.com/questions/56851845/how-to-change-the-input-slider-thumb-colour-depending-on-value
- this showed me how to set the color (kind of)
- https://stackoverflow.com/questions/18493591/change-color-of-input-range-slider-with-javascript
- this was more helpful (than the above)
- https://stackoverflow.com/questions/35835362/what-does-dollar-sign-and-curly-braces-mean-in-a-string-in-javascript
- this explains string interpolation