body{font-family:Arial,sans-serif;display:flex;justify-content:center;align-items:center;height:100vh;margin:0;background-color:#f9f9f9;flex-direction:column}button{font-size:1rem;padding:10px 20px;border:none;border-radius:5px;background-color:#007bff;color:#fff;cursor:pointer;margin-top:1em}.header{font-size:1.75rem;font-weight:700;padding:20px;background-color:#b6cee8;border-top-left-radius:8px;border-top-right-radius:8px}a{color:#007bff;text-decoration:none}h1{margin:0;font-size:1.75rem}.app{min-height:18em;text-align:center;background:#fff;box-shadow:0 4px 15px #0000001a;border-radius:8px;width:100%;display:flex;flex-direction:column;max-width:600px}.step-container{flex-grow:1;display:flex;justify-content:center;flex-direction:column;padding:40px}.hidden{display:none!important}.code-box{font-size:1.5rem;background-color:#f0f0f0;padding:10px;border-radius:5px}.spinner-container{margin-top:20px;height:60px;display:flex;justify-content:center;align-items:center}.spinner{border:4px solid rgba(0,0,0,.1);width:40px;height:40px;border-radius:50%;border-left-color:#333;animation:spin 1s infinite linear}.spinner.hidden{visibility:hidden}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}