Optimize website to look good on mobile (like in isobot's website)

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And also find out what the hell is wrong here, because I legit copied the entire code from isobot's website (but it still looks like trash)

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Reference:

• https://github.com/PyBotDevs/isobot/blob/main/index.html
• https://github.com/PyBotDevs/isobot/blob/main/style.css