body, html {
    height: 100%;
}

.content-wrapper {
    min-height: calc(100vh - 60px);
    display: block;
    margin-top: 80px;
    text-align: center;
}

.panel {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding: 5px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.5);
    background-color: #181818;
}

.captcha-box {
    text-align: center;
    margin-bottom: 10px;
}

.captcha-image {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    border: 1px solid #ccc;
    padding: 5px;
    background: #fff;
    margin-bottom: 10px;
}

.captcha-button {
    margin-top: 5px;
}


@media (max-width: 768px) {
    .content-wrapper {
        margin-top: 60px;
    }
}