shoelace/docs/assets/plugins/code-block/code-block.css

.code-block {
  position: relative;
  border-radius: 3px;
  background: var(--sl-color-gray-50);
  margin-bottom: 1.5rem;
}

.code-block__preview {
  position: relative;
  border: solid 1px var(--sl-color-gray-200);
  border-bottom: none;
  border-top-left-radius: 3px;
  border-top-right-radius: 3px;
  background-color: white;
  min-width: 20rem;
  max-width: 100%;
  padding: 1.5rem 3.25rem 1.5rem 1.5rem;
}

/* Block the preview while dragging to prevent iframes from intercepting drag events */
.code-block__preview--dragging::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: ew-resize;
}

.code-block__resizer {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 1.75rem;
  font-size: 20px;
  color: var(--sl-color-gray-500);
  background-color: white;
  border-left: solid 1px var(--sl-color-gray-200);
  border-top-right-radius: 3px;
  cursor: ew-resize;
  transition: 250ms background-color;
}

.code-block__resizer:focus {
  outline: none;
  box-shadow: 0 0 0 1px var(--sl-color-primary-400), 0 0 0 var(--sl-focus-ring-width) var(--sl-focus-ring-color-primary);
  background-color: var(--sl-color-primary-50);
  color: var(--sl-color-primary-500);
  z-index: 2;
}

@media screen and (max-width: 600px) {
  .code-block__preview {
    padding-right: 1.5rem;
  }

  .code-block__resizer {
    display: none;
  }
}

.code-block__source {
  border: solid 1px var(--sl-color-gray-200);
  border-bottom: none;
  border-radius: 0 !important;
  margin: 0;
  display: none;
}

.code-block__source .docsify-copy-code-button {
  border-top-right-radius: 0;
}

.code-block--expanded .code-block__source {
  display: block;
}

.code-block__toggle {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 2.5rem;
  border: solid 1px var(--sl-color-gray-200);
  border-bottom-left-radius: 3px;
  border-bottom-right-radius: 3px;
  background: var(--sl-color-white);
  font: inherit;
  font-size: 0.875rem;
  color: var(--sl-color-gray-600);
  cursor: pointer;
  transition: 250ms background-color;
  -webkit-appearance: none;
}

.code-block__toggle:hover,
.code-block__toggle:active {
  border-color: var(--sl-color-primary-400);
  background-color: var(--sl-color-primary-50);
  color: var(--sl-color-primary-500);
}

.code-block__toggle:focus {
  outline: none;
  border-color: var(--sl-color-primary-400);
  background-color: var(--sl-color-primary-50);
  color: var(--sl-color-primary-500);
  box-shadow: 0 0 0 var(--sl-focus-ring-width) var(--sl-focus-ring-color-primary);
}

.code-block__toggle svg {
  width: 1em;
  height: 1em;
  margin-left: 0.25rem;
  transition: 250ms transform;
}

.code-block--expanded .code-block__toggle svg {
  transform: rotate(180deg);
}

/* Dark theme */
.sl-theme-dark .code-block {
  background-color: var(--sl-color-gray-800);
}

.sl-theme-dark .code-block__preview {
  background-color: var(--sl-color-gray-900);
  border-color: var(--sl-color-gray-800);
}

.sl-theme-dark .code-block__source {
  border-color: var(--sl-color-gray-800);
}

.sl-theme-dark .code-block__resizer {
  border-left-color: var(--sl-color-gray-800);
  background-color: var(--sl-color-gray-900);
  color: var(--sl-color-gray-400);
}

.sl-theme-dark .code-block__toggle {
  background-color: var(--sl-color-gray-900);
  border-color: var(--sl-color-gray-800);
  color: var(--sl-color-gray-400);
}

.sl-theme-dark .code-block__toggle:hover,
.sl-theme-dark .code-block__toggle:active {
  background-color: var(--sl-color-gray-900);
  border-color: var(--sl-color-gray-800);
  color: var(--sl-color-gray-400);
}

.sl-theme-dark .code-block__toggle:focus {
  border-color: var(--sl-color-primary-500);
  background-color: var(--sl-color-primary-900);
  color: var(--sl-color-primary-500);
}