body{font-family:'Montserrat',sans-serif;margin:20px;background:#f9f9f9;color:#333;}
h1{font-family:'Playfair Display',serif;}
.lesson{border:1px solid #ddd;padding:15px;margin:10px 0;background:#fff;border-radius:5px;}
button{padding:8px 12px;background:#2b7a78;color:#fff;border:none;border-radius:4px;cursor:pointer;}
button:hover{background:#3aafa9;}