How Can I Make Something Like this?

I’ve spent about a day looking for something very simple with a white background and I’ve come to nothing. I’m not the greatest at the coding so if can someone point me to the right direction.

I came across a site and it’s just perfect. It’s simple and to the point. –> https://sannahkvist.se

How do you make a theme this simple? Please help and I apologize if this is silly, but hey I’m new to this.

Thank you in advance.