message: fix border radius of comment overview
diff: border-bottom-style: solid
  theme-prop('border-color', 'bg-subtle')
  +.-comment-container:last-child
  + .-comment
  + border-bottom-left-radius: $border-radius-large
  + border-bottom-right-radius: $border-radius-large
  +.-comment-container:first-child
  + .-comment
  + border-top-left-radius: $border-radius-large
  + border-top-right-radius: $border-radius-large
  +
  .-comment
  padding: 10px
  