.login-form {
    border: 1px solid #888;
    border-radius: 30px;
    padding: 30px;
}

.main-content {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 80px);
    flex-direction: column;
}

/* Captcha image — visible border on light and dark backgrounds */
.captcha {
    background-color: #ffffff;
    display: block;
    flex-shrink: 0;
}