I'm looking to create a conic-gradient with a transparent middle section. The example below demonstrates how to achieve this using a radial gradient:
background: radial-gradient(circle, transparent 0% 35%, #0a0a0a 35%);
You can view the result here: https://jsfiddle.net/jty64ha3/
https://i.sstatic.net/pU4iF.png
To incorporate a conic-gradient instead, where the middle is also see-through, you can use this code snippet: https://jsfiddle.net/yug4ht8n/
repeating-conic-gradient(blue, black 0.00306deg);