So after many weeks, I got back to coding and I've got a problem.
The project I was working on contains the basic stuff of a PHP site and now I'm trying to re-design my homepage.
The problem is, that everytime I delete or change something in the CSS, the design never changes as if it's like frozen or something, and it happens for every page. When I delete the link to the CSS in my HTML, the design goes away. Here's the code:
var scrolled=0;
    $(document).ready(function() {
        $("#master").click(function() {
            $("#holder").slideToggle('slow');
        });
                
        $("#down").on("click" ,function() {
            scrolled=scrolled+300;
            $("#solut").animate({
                scrollTop: scrolled
            });
        });
    });@font-face {
      font-family: 'FontAwesome';
      src: url('../fonts/fontawesome-webfont.eot?v=4.7.0');
      src: url('../fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff2?v=4.7.0') format('woff2'), url('../fonts/fontawesome-webfont.woff?v=4.7.0') format('woff'), url('../fonts/fontawesome-webfont.ttf?v=4.7.0') format('truetype'), url('../fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format('svg');
      font-weight: normal;
      font-style: normal;
    }
    
    body {
        margin: 0;
        padding: 0;
        background-color: #e0e0e0;
        overflow-x: hidden;
    }
    .navbar {
        width: 100%;
        height: 60px;
    }<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<html>
    <head>
        <meta charset="utf-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1"/>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <link rel="icon" href="assets/logo.png" />
        <link href="css/font-awesome.min.css" rel="stylesheet" />
    </head>
    <body>
        <center>
          //code goes here: bunch of divs and texts
        </center>
    </body>
    </html> 
     
    