textual/docs/snippets/scalar_syntax.md

A scalar can be any of the following:

• a fixed number of cells (e.g., 10);
• a fractional proportion relative to the sizes of the other widgets (e.g., 1fr);
• a percentage relative to the container widget (e.g., 50%);
• a percentage relative to the container width/height (e.g., 25w/75h);
• a percentage relative to the viewport width/height (e.g., 25vw/75vh); or
• the special value auto to compute the optimal size to fit without scrolling.