NB: vh works only for laptops and bigger screen sizes because for mobile screens which are smaller the vh also takes into account the browser window which shows the website and the items such as the volume, battery, etc above the browser window.
This can be done in CSS alone, no Javascript required.
The correct way is to use the vh and vw units:
vh: 1/100th of the height of the viewport.
vw: 1/100th of the width of the viewport.
As such, giving the element you wish to be 100% as high as the viewport a height setting of 100vh will give you what you're after.
html,
body {
height: 100%;
margin: 0;
}
section {
height: 100vh;
}
section:nth-child(1) {
background: lightblue;
}
section:nth-child(2) {
background: lightgreen;
}
section:nth-child(3) {
background: purple;
}
section:nth-child(4) {
background: red;
}
section:nth-child(5) {
background: yellow;
}
<section></section>
<section></section>
<section></section>
<section></section>
<section></section>
Alternatively, you will need to set the dimensions of the element relative to the parent html and body elements, which will need to have a height of 100%:
html,
body {
height: 100%;
width: 100%;
margin: 0;
}
section {
height: 100%;
width: 100%;
}
section:nth-child(1) {
background: lightblue;
}
section:nth-child(2) {
background: lightgreen;
}
section:nth-child(3) {
background: purple;
}
section:nth-child(4) {
background: red;
}
section:nth-child(5) {
background: yellow;
}
<section></section>
<section></section>
<section></section>
<section></section>
<section></section>
