Hi there, I'm Matt Sergei (do call me Matt) and can help you (25 years a webmaster).
Maybe you just have forgotten stroke commands when using canvas. There is no styling per se as in HTML DOM and SVG (with CSS) so you need to script all styles to canvas elements.
Drawing a circle in canvas is mathematically easy with arcs.
So, just provide a code, what you need (what color of circle edges/borders, how thick) and current circle creation code.
Regards,
Matt