Proposal: Shadows in Dark Theme don't work.

[gobijan]

This is about Bulma.

Overview of the problem

This is about the Bulma CSS framework

I'm using Bulma 1.0.2

Description

The shadow design for cards and boxes etc. doesn't look good in Dark Mode

In order to keep the high visual quality of the framework we should adjust this behaviour by providing a different dark mode default. See here for examples of efficient Dark Mode Design: https://medium.com/@tundehercules/designing-effective-dark-mode-interfaces-17f38ecea2e9

In case this get's accepted I will create a PR