Unless specified, there is no space between the cells.

You can add spacing by using those properties:

• column-gap
• row-gap

or the shorthand syntax gap.

Example:

.container {
  display: grid;
  grid-template-columns: 100px 200px;
  grid-template-rows: 100px 50px;
  column-gap: 25px;
  row-gap: 25px;
}

The same layout using the shorthand:

.container {
  display: grid;
  grid-template-columns: 100px 200px;
  grid-template-rows: 100px 50px;
  gap: 25px;
}

Lessons in this unit:

0:	Introduction
1:	grid-template-columns and grid-template-rows
2:	Setting columns and rows dimensions
3:	▶︎ Gap between the cells
4:	Span items on multiple columns and/or rows
5:	Minimum row width
6:	Layout using grid-template-areas
7:	Example: simple grid layout
8:	Example: grid layout with header, sidebar, content and footer