Change dropdown colour in product block

Hello. Does anyone know how to change the colour of the dropdown menu handle in the product block?

It is currently blue, but I would like to change it so that it is consistent with the theme/colouring of the rest of my website.

You can use a variation of this:

select {
  background: orange;
  width: 200px;
  font-size: 16px; 
  border: 0;
  border-radius: 0;
  height: 35px;
}

Which gives you this:

Change the color and sizes as you need.