<div class="container">
<span class="demo center">Thing that should be centered on the page</span>
</div>
.container {
width: 100vw;
height: 100vh;
}
.center {
bottom: 0;
height: 100px;
left: 0;
margin: auto;
position: absolute;
right: 0;
top: 0;
width: 100px;
}
.demo {
background-color: gray;
color: white;
padding: 0.25em;
}
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