.wa-container {
    max-width: 350px;
    margin: auto;
    padding: 20px;
    border: 1px solid #ddd;
    text-align: center
}

input,
button {
    width: 100%;
    padding: 10px;
    margin: 5px 0
}

button {
    background: #25D366;
    color: #fff;
    border: none
}
#wa_msg {
    margin-top: 10px;
    color: red;
}
#resendOtp:disabled {
    background: #ccc;
    cursor: not-allowed;
}