Question: Why does the border-top of .topic-avatar end up appearing as a separator between the part of the previous post that remains visible during scrolling and the beginning of the current post? Is that the actual intention of this border-top, or is there some positioning/overflow rule causing it to behave this way?
@media (width >= 40rem) {
.topic-avatar {
border-top: 1px solid var(--content-border-color);
padding-top: var(--space-4);
width: var(--topic-avatar-width);
float: left;
z-index: 2;
height: 100%;
overflow-anchor: none;
}
}

