Input's style should match the color theme

[jgobi]

Hello! I'm using the dark theme in a project with the variables introduced in PR #50. But the inputs look weird beeing always white.

It would be nice if the color and background color of the inputs matched the theme. I've managed to do this adding these two lines in the input's rule:

color: var(--font-color);
background-color: var(--bg-color);