Announcement Bar - white blocks have appeared

Afternoon experts

I’ve recently added a second section to my announcement bar and white blocks have appeared at either end where the scrollable arrows are. Does anyone know how to remove the white blocks [screenshot below]?

website is www.hobbster.co.uk

@Solomond - please add this css to the very end of your base.css file and check

.announcement-bar .slider-button {background-color: #5f9ea0;}

Worked perfectly. Thank you.

@Solomond - great, please accept it as solution