I have copied this code from a free website, it is completely working on this website, but when I use it on my website, it gives me errors such as; unexpected token and '}'expected.. I will add both HTML and CSS codes below, and I will also add the original navigation that I copied the code from, thank you in advance, really appreciate your time and consideration.
This is the website that I got the code from, please take a look:
https://codepen.io/bonkalol/pen/adHBz
/* CSS Code */
* {
box-sizing: border-box;
}
@import url(https://fonts.googleapis.com/css?family=PT+Sans);
html, body {
margin: 0;
padding: 0;
}
body {
font-family: 'PT Sans', Arial, Verdana;
background-color: #eee;
}
h1 {
text-align: center;
font-size: 48px;
text-transform: uppercase;
letter-spacing: 3px;
color: #222;
}
.menu {
list-style: none;
margin: 0;
padding: 0;
width: 100%;
height: 120px;
margin: auto;
position: relative;
background-color: #2c3e50;
z-index: 7;
li {
float: left;
width: 25%;
height: 100%;
margin: 0;
padding: 0;
}
a {
display: flex;
width: 100%;
height: 100%;
justify-content: center;
align-items: center;
color: #fff;
text-decoration: none;
position: relative;
font-size: 18px;
z-index: 9;
}
}
a.active {
background-color: #ffc312;
pointer-events: none;
color: black;
}
li.slider {
width: 25%;
height: 100%;
position: absolute;
left: 0;
top: 0;
background-color: #e74c3c;
z-index: 8;
transition: left .4s, background-color .4s;
}
.menu li:nth-child(1):hover,
.menu li:nth-child(1):focus,
.menu li:nth-child(1):active {
& ~ .slider {
left: 0;
background-color: #3498db;
}
}
.menu li:nth-child(2):hover,
.menu li:nth-child(2):focus,
.menu li:nth-child(2):active {
& ~ .slider {
left: 25%;
background-color: #9b59b6;
}
}
.menu li:nth-child(3):hover,
.menu li:nth-child(3):focus,
.menu li:nth-child(3):active {
& ~ .slider {
left: 50%;
background-color: #e67e22;
}
}
.menu li:nth-child(4):hover,
.menu li:nth-child(4):focus,
.menu li:nth-child(4):active {
& ~ .slider {
left: 75%;
background-color: #16a085;
}
}
/* HTML Code */
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<title>Login</title>
<meta charset="UTF-8">
<title>BootStrap</title>
<link rel="stylesheet" href="css/bootstrap.css">
<link rel="stylesheet" type="text/css" href="Header.css";
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<header>
<ul class="menu">
<li><a href="#" class="active">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">Signup/Signin</a></li>
<li class="slider"></li>
</ul>
</header>