I can not detect the responsive in mobile first. What can be the fault? Because at the desk, everything seems right.
Easier. I put here the link of my github repository where I uploaded it. So far it does not work with what they have proposed and I have been missing for 2 days and 9hrs = (, but I appreciate your contributions. link
Thanks for taking the time to help me, thanks in advance
I hope you're ok, I'll share the full code of my index.html I just added the basic structure for HTML, as I see in the images you added, you have not linked your style sheet to HTML, and I think you're missing the <meta name="viewport" content="width=device-width, initial-scale=1.0"> tag that allows you to indicate how a web project will look on the device by scaling the width. I put the CSS exactly as you do, I did not change anything.
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Your page title here :)</title>
<meta name="description" content="">
<meta name="author" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="main.css">
</head>
<body>
<div class="contador parallax">
<div class="contenedor">
<ul class="resumen-evento clearfix">
<li><p class="numero">6</p> Invitados</li>
<li><p class="numero">15</p> Talleres</li>
<li><p class="numero">3</p> Días</li>
<li><p class="numero">9</p> Conferencias</li>
/ul>
</div>
</div>
</body>
</html>
RESULT
I hope you can help me.