How to remove the word 'category'

Site URL: https://www.paulcoghlin.com/behind-the-eyes-limited-edition-animal-prints

Hello

Does anyone know how to remove the word 'category' that appears on the drop down category menu on a mobile device please?  It doesn't appear on the website when viewed on a desktop PC (instead it displays the actual category, which is what I want). 

When viewed on a mobile device, I want the actual category to show (in this case for example, I want Behind The Eyes to show, rather than the word 'category': https://www.paulcoghlin.com/behind-the-eyes-limited-edition-animal-prints

Hope this makes sense! Thank you.

@media screen and (max-width:640px) {
  .ProductList-filter-list {
      display: block !important;
  }

  .ProductList-filter-dropdownToggle-label {
      display: none !important;
  }
}

Thanks @rwp

 I have add this in the Custom CSS, but it has highlighted an issue: Syntax Error on line 9.

Not sure how to rectify - thanks for your help!

Can you post a screen shot?

@rwp - I've just tried again and it's now working! I hadn't realised the first line of the CSS code had to be included 😕

Thank you so much for your help.

Best wishes

Karina