min-width

<!DOCTYPE html>
<html>
<head>
<style>
span {
  background-color: yellow;  
}

span.ex1 {
  min-width: 500px;
  display: inline-block;
}
</style>
</head>
<body>
<h1>The min-width Property</h1>

<h2>min-width: none (default):</h2>
<span>Lorem ipsum dolor sit amet...</span>

<h2>min-width: 500px:</h2>
<span class="ex1">Lorem ipsum dolor sit amet...</span>

</body>
</html>