[Skye] How to change the SVG Next/Previous Blog Post Icon

Hi all,

I'm working in the following website page:
https://hqwebsitestudy.squarespace.com/home/jamd
Password: 12345678

I'd like to know if it's possible to replace the blue arrow that indicates the next post for a blue circle.
I've uploaded a bluecircle.png icon on css custom files but haven't found a way to replace the 
svg.next-icon for the new asset.

If so, what code injection can help me achieve this result for both Next (right) and Previous (left) arrows?

Thanks in advance,
Eliahu

add to Home > Design > Custom CSS

.blog-item-label svg {
    display: none;
}
.blog-item-label {
    background-image: url(https://beaverhero.com/wp-content/uploads/2019/06/trees-3464777_640-min.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}