<style>
.maincont {
width: 8em;
height: 8em;
background: purple;
}
body {
background: limegreen;
display: flex;
flex-direction: column;
place-content: center;
place-items: center;
}
</style>
<body>
<div class="maincont"></div>
</body>
Can you figure out why the purple square isn't centered on the page despite using the flex-direction property with a value of column?
Once you've verified that everything is working properly, adjust the purple box so that it sits perfectly in the middle of the page. If it's not displaying correctly, consider clearing your browser's cache and cookies before giving it another go.
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