.ab-optin-popup-form {
    background-color: #428bca;
    max-width: 500px;
    height: auto;
    padding: 20px;
    box-shadow: inset 0px 0px 200px -58px rgba(0,0,0,0.75);
    font-family: Arial, sans-serif;
    color: #fff;
    text-align: center;
    margin: 20px auto;
}

.ab-optin-popup-form .ab-optin-heading {
    font-size: 24px;
    font-weight: 900;
    text-shadow: 0px 3px 4px rgba(0, 0, 0, 0.25);
    margin: 0 0 20px 0;
}

.ab-optin-popup-form .ab-optin-image-container {
    width: 200px;
    height: 300px;
    margin: 0 auto 20px auto;
}

.ab-optin-popup-form .ab-optin-image-container img {
    width: 100%;
    height: 100%;
    display: block;
}

.ab-optin-popup-form .ab-optin-description {
    font-size: 20px;
    margin-bottom: 20px;
}

.ab-optin-popup-form form {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.ab-optin-popup-form input[type="text"],
.ab-optin-popup-form input[type="email"] {
    width: 80%;
    line-height: 36px;
    margin-bottom: 10px;
    padding: 0 8px;
    font-size: 16px;
    border: 1px solid #ddd;
    color: #000;
}

.ab-optin-popup-form .ab-optin-submit-btn {
    background-color: #51b6f4;
    background-image: linear-gradient(to bottom, #51b6f4, #19a5fb);
    color: #fff;
    padding: 10px 15px;
    border: none;
    border-radius: 30px;
    font-size: 16px;
    cursor: pointer;
}

.ab-optin-popup-form .ab-optin-message {
    margin-top: 10px;
    font-size: 16px;
}