Very good. I have a problem to understand the following:
I have a "label" label to which I apply a width of 230px, since "label" is an inline label, no change occurs, ok, so everything is fine. 
What I do not understand is, why when applying the property "float: left", the width of 230px becomes effective?
I know that the exercise may seem absurd, I am learning CSS3 on my own and this doubt came to me. Thank you in advance for the help.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
label{
width: 230px;
background-color: green;
float: left;
}
</style>
</head>
<body>
<label for="texto">Nombre</label>
<input type="text" id="texto">
</body>
</html>