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OpenLayers - Use SVG icons for markers

On one of my projects we are using OpenLayers to visualize geographical data. I got stuck when I tried to show markers on a map by using SVG icons.
My first attempt looked like this:


But on the map I only got a weird black triangle.😕

I tried a lot of alternatives but nothing made any difference. In the end I found out that I could fix it by specifying a size(width and height) inside my SVG file:


 Remark: Changing the scale and size properties on the style seems to have no affect when using SVG’s. So make sure to set an appropriate size in the SVG file.

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