.site-logo {
  vertical-align: middle;
  color: #424242;
}

.site-header a:hover .site-logo {
  color: #111;
}

.shell-prompt::before {
  content: "$ ";
  color: #999;
  user-select: none;
  -webkit-user-select: none;
}

.copy-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  padding: 2px 8px;
  font-size: 0.75rem;
  color: #666;
  background: #f0f0f0;
  border: 1px solid #ddd;
  border-radius: 3px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s;
}

[class*="language-"]:hover .copy-btn,
div.highlight:hover > .copy-btn {
  opacity: 1;
}

.copy-btn:hover {
  background: #e0e0e0;
  color: #333;
}

details {
  margin-bottom: 1em;
}