My name is Tsvetomir and I am temporarily stepping in for my colleague Alex.
In general, the direct export of an SVG element to PDF is not supported. The Kendo UI library has implemented its internal logic to export such elements.
The colors used in the exported file are the ones that come from the options of the Kendo UI Chart. Even if the appearance is alternated with CSS and visually the elements' fills are changed, the exported element would pick up the colors from the options of the chart. In case there is a theme applied to the page and the options are not set, the default colors from the theme would be utilized.
What I can recommend is that you make use of the exposed API of the Kendo UI Chart and set up the coloring there. Also, you could apply those styles programmatically and dynamically with the help of the setOptions() method. More information could be found here:
I hope you find those clarifications helpful.
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