In this exercise, in step 2, how grid calculate 1/3 fr of 500px?Can someone explain that?

You don’t need to calculate `1/3`

of the height-CSS will do that for you. What way can you have an equal *fraction*(hint) size of each row.

## Hint if you're stuck

When you have a row of `1fr`

, it sets it to the whole size of the available space. If you set a row to:

```
row a: 1fr
row b: 2fr
row c: 3fr
```

In this case, `row a`

takes up `1/6`

of the available space. `row b`

takes up `2/6`

or `1/3`

of the available space. And `row c`

takes up `3/6`

or `1/2`

of the available space.

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