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How to make a div cover the whole screen

I have a question.

I got this so far: enter image description here

I basically want the highlighted div to cover your device screen no matter how big the device screen is. now i see 2 different divs when i open this on my phone. i only want to see the one that is highlighted. How do I achieve this?

Thanks in advance, kevin

Solution

  • You could use viewport height as your height value: 

    .main {
    height: 100vh;
    background-color: green;
}
    <div class="main">
  CONTENT
</div>

    Using height: 100vh means the element in question always be 100% height of the viewport a user / devie has.

    More info: https://web-design-weekly.com/2014/11/18/viewport-units-vw-vh-vmin-vmax/