#sidediv {
  background-color: transparent;
  border: none;
  opacity: .8;
}

#sidedivinner>div:before {
  font-family: var(--main-font-family); /* the parent div have font-family monospace (line number) */
  color: #485365;
  color: var(--text-color);
  font-weight: bold;
}

#sidedivinner>div .line-number {
  line-height: inherit;
  font-family: RobotoMono;
  display: inline-block;
  color: #576273;
  color: var(--text-soft-color);
  height:100%;
}

#sidedivinner>div .line-number:hover {
  background-color: var(--bg-soft-color);
  border-radius: 5px 0 0 5px;  
  font-weight: bold;
  color: var(--text-color);
}
.plugin-ep_author_neat #sidedivinner>div .line-number:hover {
  background-color: transparent;
}