Valkyrie | A Fullstack Discord Clone using React and Go | Socket library

My entire code:

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:

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