After 8 years of being frustrated with HTML/CSS... How to take a sketch of a webpage I've made on a piece of paper and write the HTML/CSS for it while feeling

After 8 years of being frustrated with HTML/CSS... How to take a sketch of a webpage I've made on a piece of paper and write the HTML/CSS for it while feeling like I can predict how things will be laid out rather than feeling like I'm playing whack-a-mole. I think I've learned that I just cannot do achieve this with block/inline/inline-block and I need to stick with flexbox. I'd like to either learn a CSS framework or learn sass and write my own.