.filter-btn {
    padding: 10px 20px;
    margin-right: 10px;
    background: transparent;
    border: 1px solid #e0e0e0;
    cursor: pointer;
    transition: all 0.3s;
}
.filter-btn.active {
    background: #222;
    color: white;
    border-color: #222;
}