.about-tab-btn {
    padding: 8px 16px;
    margin-right: 8px;
    border: none;
    background: #e0e0e0;
    color: #333;
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
    transition: background 0.2s, color 0.2s;
}
.about-tab-btn.active {
    background: #d32f2f;
    color: #fff;
}
.about-tabs-content {
    margin-top: 20px;
}