Hi Javier,

Can you please add the code below to Custom CSS

.sidebar .sidebar-entry .price_slider_wrapper .price_slider_amount .button {
    background: red !important;
}

.sidebar .sidebar-entry .price_slider_wrapper .price_slider .ui-slider-range {
    background: red !important;
}

.sidebar .sidebar-entry .price_slider_wrapper .price_slider .ui-slider-handle {
    background: red !important;
}