Answers for "css height in %"

css height property

/* <length> values */
height: 300px;
height: 25em;

/* <percentage> value */
height: 75%;

/* Keyword values */
height: max-content;
height: min-content;
height: fit-content(20em);
height: auto;

/* Global values */
height: inherit;
height: initial;
height: unset;

set height to width css

example {
  height: 100px;
  width: 100px;
  background-color: blue;
}