body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

a {
 color: white;
}

a:link {
  color: white;
}

a:visited {
  color: white;
}

a:hover {
  color: white;
}

a:active {
  color: white;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 1rem;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

.main {
    padding: 2rem;
}

.hero {
    background: #f4f4f4;
    padding: 2rem;
    text-align: center;
}

.hero h2 {
    margin: 0;
}

.hero p {
    margin: 1rem 0;
}

.hero .btn {
    background-color: #333;
    color: #fff;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 5px;
}

.courses {
    padding: 2rem;
}

.course {
    background: #fff;
    margin-bottom: 1rem;
    padding: 1rem;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.course h3 {
    margin-top: 0;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    bottom: 0;
}