如何去除按钮底部空白？网站按钮布局问题求助

Hey everyone, I'm currently building a new website and aiming to achieve the design shown below:

However, my current implementation has an issue with the bottom spacing of the PURCHASE button, as you can see here:

My code is hosted in this GitHub repository: https://github.com/rittamdebnath/papercutlabs_new

I'd be really grateful if any fellow developers could help me resolve this spacing problem!

内容的提问来源于stack exchange，提问作者rittam