body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
}
header {
    background-color: #4CAF50;
    color: white;
    padding: 20px 10px;
    text-align: center;
}
nav {
    display: flex;
    justify-content: center;
    background: #333;
}
nav a {
    color: white;
    padding: 14px 20px;
    text-decoration: none;
    text-transform: uppercase;
}
nav a:hover {
    background: #575757;
}
.container {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
}
.about {
    text-align: center;
    margin: 40px 0;
}
.about h2 {
    color: #333;
}
.courses {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}
.course {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.course h3 {
    color: #4CAF50;
}
footer {
    text-align: center;
    padding: 10px;
    background: #333;
    color: white;
}