body {
    margin: 0;
}

#header {
    color: white;
    padding: 10px;
    text-align: center;
}

#referral-content {
    width: 100%;
    min-height: 70vh;
    overflow: auto;
    padding: 10px;
    box-sizing: border-box;
}

#referral-frame {
    width: 100%;
    height: 70vh;
    border: none;
}

#frame-error {
    margin-top: 10px;
}

#footer {
    background-color: #343a40;
    color: white;
    padding: 10px;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
}

#customize-form {
    margin: 20px;
    padding: 10px;
    border: 1px solid #ccc;
    max-width: 300px;
}

#customize-form label, #customize-form input, #customize-form select, #customize-form button {
    display: block;
    margin: 5px 0;
}

#referral-list {
    margin: 20px;
}

#referral-list ul {
    list-style: none;
    padding: 0;
}

#referral-list li {
    margin: 5px 0;
}