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<!DOCTYPE html>
<meta charset="utf-8">
<style>
#grid {
display: grid;
grid-template-columns: 1fr 30px;
border: 10px solid fuchsia;
width: min-content;
}
#item {
grid-column: 1 / span 2;
}
#filler {
width: 300px;
height: 50px;
background: aqua;
}
</style>
<div id="grid">
<div id="item">
<div id="filler"></div>
</div>
</div>