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h1{margin-right:0;font-size:1.5rem}.lesson-navigation{flex-direction:column;gap:15px}.nav-btn{width:100%}.certificate-section{margin-top:20px;padding:20px}.certificate-btn{width:100%;padding:12px 20px;font-size:1rem}}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;background:#0c0c0c;color:#fff;font-family:Courier New,monospace}#root,.App{min-height:100vh}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#1a1a1a}::-webkit-scrollbar-thumb{background:#0f0;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#0c0}::selection{background:#00ff004d;color:#fff}