Need Help With This Grid properties ASAP

Tell us what’s happening:
I already tried many website to find more explanation about this part but it turns out that i found nothing because i really don’t understand.

The question asked me to consume the last two columns and somehow i tried 2 / 4; and it was right . Please explain more about this part . What is the output going to show me actually ? . Thank You,

Q : Make the item with the class item5 consume the last two columns of the grid.
Your code so far


.item5 {
  background: PaleGreen;
  /* Only change code below this line */

  /* Only change code above this line */

.container {
  font-size: 40px;
  min-height: 300px;
  width: 100%;
  background: LightGray;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr;
  grid-gap: 10px;

<div class="container">
<div class="item1">1</div>
<div class="item2">2</div>
<div class="item3">3</div>
<div class="item4">4</div>
<div class="item5">5</div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36.

Challenge: Use grid-column to Control Spacing

Link to the challenge:

Hey there @syafiyft,

That looks like the starter code… Have you tried anything to solve this challenge?

well i have edit the actual code they gave . thats the original one . thanks but i think i got it