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<!DOCTYPE html><style>
* {
border: 1px solid black;
}
body {
display: grid;
grid-template-rows: 1fr;
}
.foo {
width: 100px;
height: 100px;
grid-row: 1;
grid-column: 1;
}
.bar {
grid-row: 1;
grid-column: 1;
}
</style><body><div class="foo">foo</div><div class="bar">bar</div></div>