SciChart.js ships with ~60 JavaScript Chart Examples which you can browse, play with, view the source code and see related documentation. All of this is possible with the SciChart.js Examples Suite, which ships as part of the SciChart.js SDK
Demonstrates the light and dark theme in SciChart.js, High Performance JavaScript Charts
SciChart.js ships with a light and a dark theme, which you can switch by calling the SciChartSurface.applyTheme() function.
If you implement IThemeProvider you can create your own custom themes! It's also possible to style chart-parts in code.