body { 
    font-family: Arial; 
    max-width: 500px; 
    margin: 50px auto; 
    padding: 20px; 
}

.form-group { 
    margin-bottom: 15px; 
}

label { 
    display: block; 
    margin-bottom: 5px; 
    font-weight: bold; 
}

input { 
    width: 100%; 
    padding: 10px; 
    border: 1px solid gray; 
    box-sizing: border-box; 
}

button { 
    width: 100%; 
    padding: 12px; 
    background: blue; 
    color: white; 
    border: none; 
    cursor: pointer; 
}

.erreur { 
    background: pink; 
    color: red; 
    padding: 10px; 
    margin-bottom: 15px; 
}

.lien { 
    text-align: center; 
    margin-top: 20px; 
}