Hi,
You seem to already have the CSS code for the nav links as shown here: (from sccss file, perhaps a plugin?)
.post-navigation .nav-links div {
display: flex;
flex-direction: column;
flex: 1 0 calc(50% - 2px);
margin: 2px;
padding: 30px;
box-sizing: border-box;
position: relative;
background-color: #ffffff;
border: 1px solid #f3f3f3;
transition: background 0.2s;
border-radius: 2px;
}
You can simply change the border-radius values here to 8px.
If that doesn’t work, try this one.
.post-navigation .nav-links > .previous, .post-navigation .nav-links > .next {
border-radius: 8px;
}
As for the comment box, try this CSS:
.separate-containers .comments-area{
border-radius: 8px;
}