Timetracker widget background occludes rounded corners

[gillisandrew]

This is a small nit but should only require a small change to the stylesheet.

Here is a screenshot as it appears on windows.

The background color applied to the body tag seems suspect

solidtime-desktop/src/renderer/src/style.css

Lines 80 to 82 in dc26d94

	body {
	background-color: var(--theme-color-default-background);
	}