Ways to ensure that a div, header, container, and other elements completely cover the viewport

Currently, I am attempting to create a header that spans the entire viewport regardless of screen size. This header will be split horizontally into 3 equal sections, each occupying one third of the header space.

  • I experimented with setting the header height to 100vh, but it was unsuccessful.
  • Setting the header height to 100% also did not yield the desired result.
  • Even adjusting the background-size property of the header to cover did not work as expected.

If anyone could advise on the most effective approach to achieve this layout, I would greatly appreciate it.

Thank you in advance.

htmlcsslayout

Answer №1

Mastering the power of flexbox: https://css-tricks.com/snippets/css/a-guide-to-flexbox/

<html style="height: 100%">

  <body style="height: 100%">

    <div style="height: 100%; display: flex; flex-direction: column;">

      <div style="flex: 1; background-color: red;">1/3</div>
      <div style="flex: 1; background-color: blue;">2/3</div>
      <div style="flex: 1; background-color: black;">3/3</div>

    </div>

  </body>

</html>

Answer №2

If you're not worried about older browsers, I recommend using flexboxes for layout.

header {
  display: flex;
}

div {
  flex: 0 0 33.33%;
  border: 1px solid;
}
<header>
  <div>
    #1
  </div>
  <div>
    #2
  </div>
  <div>
    #3
  </div>
</header>

I've simplified the example, but proper browser prefixes are needed for optimal compatibility.

Answer №3

While this discussion is dated, a definitive solution was not provided. To address the scrolling problem, I consistently incorporate the following CSS code at the beginning of my pages:

* {
box-sizing: border-box;
margin: 0;
padding: 0;
}

Furthermore, I typically generate a file named "reset.css" or "reset.scss", containing the aforementioned code. For more CSS reset snippets, you can visit: .

If you search "CSS reset" on Google, this website usually appears as the second or third result.

To link your new "reset.css" or "reset.scss" in your index.html, insert the following snippet within the "head" tags. Mine is usually stored in a directory called "styles."

<link rel="stylesheet" href="../styles/reset.css">

or

<link rel="stylesheet" href="../styles/reset.scss">

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