How to make `margin: top;` based on browser height?

Tags: javascript,html,css

Problem :

The title pretty much says it all. I want the CSS margin: top; on my HTML main_content element to be relative to (a percentage of) the browser window (so that the main_content always stays on the bottom of the browser window. How can I accomplish this?

I've tried this and it doesn't work. (the body {height:100vh} doesn't seem to make body any height as the main_content doesn't stick to the bottom as it should.

body {height:100vh}
#main_content {position:absolute; width:100%; display:block; left:0; bottom:0; text-align:center; padding:20px;}
<div>Extra Infomation </div>
<div id="main_content">
<p>here you can learn about me and my adventures</p>

(Don't try this right now) If you go to my website, you will see the "learn about me and my adventures" heading, that, along with the "recent activity", and other stuff below that, that is the section I want at the bottom of the browser window, preferably with the "learn about me and my adventures" part just sticking out from the bottom of the page.

Solution :

Give .main_content a margin-top of 100vh (just beneath the viewport), and then use transformY to pull it back up:

.main_content {
    text-align: center;
    padding: 20px;
    margin-top: 100vh;
    transform: translateY(calc(-100% - 20px));
<div class="wrapper">
    <div>Extra Infomation </div>
    <div class="main_content">
        <p>here you can learn about me and my adventures</p>
<div class="below_content">
    This is content below the main content

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