I\'m trying to achieve following look, with pure css:

Where each white
I would recommend you to use SVG to draw such shapes:
In the example below I've used SVG's path element to draw an arc. This element takes single attribute d to describe the shape structure. d attributes takes a few commands and corresponding necessary parameters.
I've used only 2 path commands:
M command is used to move the pen to a specific point. This command takes 2 parameters x and y and usually our path begins with this command. It basically defines starting point of our drawing.A command which is used to draw curves and arcs. This commands takes 7 parameters to draw an arc / curve. A detailed explanation of this command is Here.Screenshot:
Useful Resources:
Working Example:
svg {
width: 33%;
height: auto;
}