<!DOCTYPE html>
<style>
.container {
font-family: monospace;
font-size: 20px;
width: 20ch;
border: 1px solid blue;
}
.float {
float: left;
width: 10ch;
height: 2em;
}
</style>
<div class="container">
<div class="float"></div>
12 456<br>890
12
</div>
<div class="container">
<div class="float"></div>
12 456 890<br>
12 456<br>890
12
</div>
<div class="container">
<div class="float"></div>
12 456 890<br>
12 456 890<br>
12 456 89 12 456 890<br>
12 456 89 12 456<br>890
12
</div>
<div class="container">
<div class="float"></div>
12 456 890<br>
12 456 890<br>
12 456 89 12 456 890<br>
12 456 89 12 456 890<br>
12 456 89 12 456 890<br>
12 456 89 12 456<br>890
12
</div>