body {
    margin: 0;
    padding: 0;
    background-image: url('Pantalla 01 BACK.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-color: #111;
    color: #fff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}
.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    box-sizing: border-box;
    text-align: center;
}
.btn {
    display: block;
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    box-sizing: border-box; /* Esta es la línea que soluciona el desbordamiento */
}
.btn-red { background-color: #cc0000; color: white; }
.btn-white { background-color: white; color: black; }
.form-group {
    margin-bottom: 15px;
    text-align: left;
}
.form-group label { display: block; margin-bottom: 5px; font-size: 14px; }
.form-group input, .form-group select {
    width: 100%;
    padding: 10px;
    border-radius: 5px;
    border: none;
    box-sizing: border-box;
    color: #333;
}
.logo { max-width: 250px; margin: 40px auto; }