Flatiron - change navigation arrows?

Site URL: https://www.8foot3.co.uk/#/packaging-design/

Hey! Does anyone know how to change the arrows on the flatiron template - ideally would like to update both sets of arrows shown in the image below so they don't boxes - possible CSS code?

Change to another icons or remove arrow background?

also can you check url? It seems can't access

Hi @tuanphan, I've checked the URL - link works ok? www.8foot3.co.uk - it is the top right arrows in black boxes - Ideally i want to change the black boxes to be black circles instead? Possible?

4 hours ago, 8FOOT3 said:

Hi @tuanphan, I've checked the URL - link works ok? www.8foot3.co.uk - it is the top right arrows in black boxes - Ideally i want to change the black boxes to be black circles instead? Possible?

Add to Home > Design > Custom CSS

a.projectPrev, a.projectNext {
    border-radius: 50%;
}

thank you @tuanphan this worked perfectly! Is there any way to reduce the size of the circles/arrows?