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the design is good (I think) but the functionality of the site is not great because I'm still in the process of learning basic javascript.

just click the preview site guys if you want to see

can you guys suggest some best practices

click the preview site guys I think the design comparison is not detecting something in my code.

I can't seem to find the right color to use. The one that they gave is not the same as the design has.

How do I just temporarily remove an element in Javascript? because in my case when I removeChild the tag that I add (which is the 'p' tag). it seems not to come back when I enter another wrong email address.

Can you guys suggest some best practices so that I can make more readable and clean code.

I kinda struggled a little bit in implementing my mobile version into the desktop. I just manually re-arrange all of the components using position: absolute; can you guys suggest how to do it more easily.

this is only a desktop version. If I want to make a mobile version of it too, should I make it first before the desktop?

I think it's not quite the same as the example of how it should look, but I did my best and I'm still learning HTML and CSS hope that I can make this look alike as the reference suggests if I do learn more.

I didn't make the mobile version because I only knew how to make the desktop one. I'm still in the learning process of HTML and CSS, so bear with me.