Answers for "make all grid items same height"

css grid column height fit content

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: minmax(min-content, max-content);
}
 /* ---OR--- */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-auto-rows: minmax(min-content, max-content);
}

css grid make all rows same height

grid-auto-rows: 1fr;

css grid make all columns same width

grid-template-columns: repeat(3, minmax(0, 1fr));