This video from Una is amazing. You have to watch it. Below was the summary that I took from her video. You can try it live on 1linelayouts.glitch.me
10 Modern CSS layout and sizing techniques highlight just how robust and impactful a single-line of styling code can be.
place-items: center
flex: 0 1 <baseWidth>
grid-template-columns: minmax(<min>, <max>) ...
grid-template-rows: auto 1fr auto
grid-template: auto 1fr auto / auto 1fr auto
grid-template-columns: repeat(12, 1fr)
grid-template-columns: repeat(auto-fit, minmax(<base>, 1fr))
justify-content: space-between
clamp(<min>, <actual>, <max>)
aspect-ratio: <width> / <height>