CSS rule affects Flarum core buttons

[SKevo18]

header-slideshow/less/forum.less

Lines 121 to 123 in a8508cd

	button.Dropdown-toggle.Button.Button--flat {
	color: #fff;
	}

The CSS rule above causes the Flarum buttons to be white, even in light mode, making them barely visible. Disabling the rule in devtools fixes the issue

Possibly related to #3