<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
.flexbox {
display: flex;
}
.grey {
background: #adadad;
flex: 0 0 50px;
overflow: hidden;
white-space: nowrap;
}
.green {
background: #32c962;
flex: 1;
}
.blue {
background: #3b66db;
flex: 1;
}
</style>
</head>
<body>
<div class="flexbox">
<div class="grey">Some really long text that should not overflow</div>
<div class="green">2</div>
<div class="blue">3</div>
</div>
</body>
</html>