body {
    font-family: Arial, sans-serif;
}

.tabs {
    display: flex;
}

.sidebar {
    width: 30%;
    padding: 10px;
    background-color: #f1f1f1;
}

.tab-content {
    width: 70%;
    padding: 10px;
}

.error {
    color: red;
}

h3 {
    margin-top: 0;
}