Set height of first row in CSS grid

Question

I have a basic CSS grid using display: grid & I'm unable to set the height of the first row using grid-template-rows.

My HTML/CSS looks roughly like this:

.gridWrapper {
  display: grid;
  height: 100vh;
  grid-template-rows: 20px auto auto;
}

.row1 {
  grid-row-end: 1;
  background-color: lightslategray;
}

.row2 {
  grid-row-end: 2;
  background-color: lightblue;
}

.row3 {
  grid-row-end: 3;
  background-color: lightskyblue;
}

.col1 {
  grid-column-end: 1;
}

.col2 {
  grid-column-end: 2;
}

<div class="gridWrapper">
  <div class="row1 col1">Col1</div>
  <div class="row1 col2">Col2</div>
  <div class="row2 col1">A</div>
  <div class="row2 col2">B</div>
  <div class="row3 col1">D</div>
  <div class="row3 col2">D</div>
</div>

However, it results in this:

This occurs in both latest Chrome & Safari (I'm on Mac), which leads me to believe I've misunderstood something about gridlayout CSS.

How do I set the height of the first row?

Answer 1

The problem is - grid-column-end (MDN) can be a bit misleading. row1 in your example should have grid-column-end: 2; instead of grid-column-end: 1;.

To fix this you can just add 1 to every grid-column-end and grid-row-end property.

Here's snippet with fixed values:

body {
  margin: 0;
}
.gridWrapper {
  display: grid;
  height: 100vh;
  grid-template-rows: 20px auto auto;
}

.row1 {
  grid-row-end: 2;
  background-color: lightslategray;
}

.row2 {
  grid-row-end: 3;
  background-color: lightblue;
}

.row3 {
  grid-row-end: 4;
  background-color: lightskyblue;
}

.col1 {
  grid-column-end: 2;
}

.col2 {
  grid-column-end: 3;
}

<div class="gridWrapper">
  <div class="row1 col1">Col1</div>
  <div class="row1 col2">Col2</div>
  <div class="row2 col1">A</div>
  <div class="row2 col2">B</div>
  <div class="row3 col1">D</div>
  <div class="row3 col2">D</div>
</div>

Also - I don't really see the need for grid-column-end here. You can achieve the same result with just grid-column and grid-row properties (which are less confusing, in my opinion).

body {
  margin: 0;
}
.gridWrapper {
  display: grid;
  height: 100vh;
  grid-template-rows: 20px auto auto;
}

.row1 {
  grid-row: 1;
  background-color: lightslategray;
}

.row2 {
  grid-row: 2;
  background-color: lightblue;
}

.row3 {
  grid-row: 3;
  background-color: lightskyblue;
}

.col1 {
  grid-column: 1;
}

.col2 {
  grid-column: 2;
}

<div class="gridWrapper">
  <div class="row1 col1">Col1</div>
  <div class="row1 col2">Col2</div>
  <div class="row2 col1">A</div>
  <div class="row2 col2">B</div>
  <div class="row3 col1">D</div>
  <div class="row3 col2">D</div>
</div>