When using a light color palette, input text is barely visible

[pablobh]

Problem

If you use a light color palette, the text on the inputs is barely visible.

Example

Here is my current color palette:

add_filter('login_color_palette', function () {
    return [
        'brand' => '#f3f3f3',
        'trim' => '#9d402d',
        'trim-alt' => '#f3f3f3',
    ];
});

This is how it looks:

As you can see, the text from the inputs is really hard to read.

Possible solution

Have an additional variable we can setup named "text" or something like that and have the inputs text use them.

Additional info

I'm using the latest version of the plugin. I think this may be related to #1

Bonus track

I know this plugin is supposed to be as simple as possible, but would it be too much to ask to add another variable for the login button? As you can see from my screenshot, the login button doesn't looks like a button, maybe add a little bit of shadow?