body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

.container {
    max-width: 600px;
    margin: 30px auto;
    padding: 20px;
    background: #fff;
    border-radius: 10px;
}

.banner {
    width: 100%;
    max-width: 100%;
    border-radius: 12px;
    display: block;
    margin: 0 auto 20px;
}

input {
    width: 100%;
    margin-bottom: 10px;
    padding: 12px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 14px;
    border: none;
    color: #fff;
    cursor: pointer;
}

.sucesso {
    text-align: center;
    padding: 20px;
}

.btn-whatsapp {
    display: inline-block;
    padding: 14px 24px;
    text-decoration: none;
    color: white;
    background: #25D366;
    border-radius: 6px;
    margin-top: 15px;
}

.banner-container{
    position:relative;
}

.audio-control{
    display:flex;
    justify-content:center;
    margin-top:8px;
    margin-bottom:15px;
}

.audio-control button{
    width:42px;
    height:42px;
    border:none;
    border-radius:50%;
    background:#ffffff;
    box-shadow:0 2px 8px rgba(0,0,0,.15);
    cursor:pointer;
    font-size:20px;
}

.audio-control button:hover{
    transform:scale(1.05);
}