Change sidebar categories color

Product Categories doesn’t have any colour attributes assigned to them; Are you referring to the image at the top instead?

.widget-area .product-categories li a,
.widget-area .product-categories li .count {
  color:#00f
}

@lorro
You sir helped a me few times!!! Many thankss man!!!

Do you also have an idea how to have 5 icons next to each other instead of 4 on this page https://autoelectronicawestland.nl/?post_type=product ??

And the label under the icons are not aligned correctly with its icon.. how do i achieve this?

Some themes have settings that allow you to change the number of items per row. If your theme doe not have this setting, there is a code snippet here you can try:
https://docs.woocommerce.com/document/change-number-of-products-per-row/

To align the text, try:

.woocommerce ul.products li.product h3,
.woocommerce-page ul.products li.product h3 {
  text-align:left;
}

@lorro tnx mate problem solved