body {font-family: Arial; background:#f5f5f5; margin:0;padding:0;}
header{text-align:center;padding:20px;background:white;}
.course-list{display:flex;gap:10px;padding:20px;}
.course-card{background:white;padding:20px;border-radius:8px;flex:1;text-align:center;}
.bundle{text-align:center;padding:20px;}
button{padding:10px 20px;background:#0077ff;color:white;border:none;border-radius:6px;}