neumorphic | A library of JavaFX controls that use a neumorphic design | User Interface library

After having horrible problems I finished by passing my project into another one. But now It gives me this error after trying to run my program. Which I never see before. And also, I didn't edit these codes because they are libraries.

I have created two neumorphic button styles: DarkButtonStyle & LightButtonStyle. I want to alternate between them on dark mode. I tried using an environment variable inside the buttonStyle configuration and that doesn't work at all. Since, the buttonStyle doesn't have simple differences such as background color I cannot simply change the fill in a generic way either

I was hoping someone could help me figure this out, i'm a newbie when it comes to coding.

I've made a form and a background in two seperate files. What i'm trying to achieve is:

1. Merge both files, wherein the form should be on the middle-right side of the screen and I want the background to stay like it is, it should keep changing both the images and background colour.
2. In the form, my scrollbar is going out of the div which has a border-radius, I want it to stay inside.
3. In the form, if you look at the dropdown menu, the bottom arrow isn't properly aligned, how can I move it towards it's left so it's visible properly.

I've tried a few solutions already, but either I mess up the background or the form's alignment changes. Please have a look at the following code for both the files and hopefully help a brother out.

I've also attached their Codepen links: (i) For the background: (ii) For the form:

CODE FOR THE BACKGROUND:

HTML:

My problem is that if I want to update the view from the toggle I can't because I need to create a new class for the screens. I want when I press the button to update my view and move the slider from the first element to the second one and I don't know how to do it work. If I want to move from the first toogleelement to the second the action work,I tried with a print but I wan't it to be more interactive so I want the slider to move. I also use a neumorphic package for design to make it a lot easier.

This is the place that have the slider,I want the slider to make a move to be interactive:

Im using the flutter_neumorphics dependency https://pub.dev/packages/flutter_neumorphic to make my circular Neumorphic containers. However I'm facing an issue when Im trying to resize it. I want the outer circle to be smaller and more compact. Here is the code I've tried:

im trying to build a calculator for practice. im using eval() to calculate the result. but im still missing one point (afaik), that is prevent zeros that create non number. for example if i have string

I made a Neumorphic-style view with a title and a neumorphic button. The view changes when I turn on dark mode in the preview code. I then decided to make a toggle that'll switch dark mode on or off. I unfortunately haven't found a way to give the toggle its functionality (but it shouldn't be creating any errors), and I get this error. I have a whole struct for the Neumorphic style before, which is why you might see terms you don't know. When I remove the toggle, the error disappears.