ant-design/site/theme/static/demo.less

.code-box-expand-trigger {
  cursor: pointer;
  font-size: 14px;
  color: #9199ac;
  margin-left: 5px;
  opacity: .8;
  transition: all .3s ease;
  top: -2px;
  position: relative;

  &-active {
    color: #3b4357;
  }
}

.code-boxes-col-1-1 {
  width: 100%;
}

.code-boxes-col-2-1 {
  display: inline-block;
  vertical-align: top;
}

.code-box {
  border: 1px solid @border-color-split;
  border-radius: @border-radius-base;
  display: inline-block;
  width: 100%;
  position: relative;
  margin: 0 0 16px;
  transition: all 0.2s ease;
}

.code-box:target {
  border: 1px solid fade(@primary-color, 70%);
  z-index: 10;
}

.code-box {
  .code-box-title a,
  .code-box-title a:hover {
    color: @text-color;
    font-size: 14px;
    font-weight: 500;
  }

  a.edit-button {
    position: absolute;
    right: -16px;
    top: 7px;
    font-size: 12px;
    transform: scale(0.9);
    background: #fff;
    padding-right: 6px;
  }
}

.code-box .code-box-demo {
  border-bottom: 1px solid @border-color-split;
  padding: 42px 20px 50px;
}

.code-box iframe {
  width: 100%;
  border: 0;
}

.code-box-meta.markdown {
  position: relative;
  padding: 17px 16px 15px 20px;
  border-radius: 0 0 6px 6px;
  transition: background-color 0.4s ease;
  width: 100%;
  font-size: 12px;
}

.code-box-meta h4,
section.code-box-meta p {
  margin: 4px 0;
  width: 93%;
}

.code-box-meta blockquote {
  margin: 0;
}

.code-box-title {
  position: absolute;
  top: -14px;
  padding: 1px 8px;
  margin-left: -8px;
  color: #777;
  border-radius: @border-radius-base;
  border-top-left-radius: 0;
  background: #fff;
  transition: background-color 0.4s ease;
}

.code-box-meta > p {
  font-size: 12px;
  margin: 0.5em 0;
  padding-right: 25px;
  width: 100%;
  word-break: break-word;
}

.code-box.expand .code-box-meta {
  border-radius: 0;
  border-bottom: 1px dashed @border-color-split;
}

.code-box .collapse {
  position: absolute;
  right: 14px;
  bottom: 22px;
  cursor: pointer;
  width: 16px;
  height: 16px;
  font-size: 16px;
  line-height: 16px;
  opacity: 0.5;
  text-align: center;
  transition: all 0.3s;
  color: #999;
  background: #fff;
  user-select: none;
  border-radius: 100%;
}

.code-box.expand .collapse {
  color: shade(@primary-color, 20%);
  transform: rotate(-180deg);
}

.code-box .collapse:hover {
  opacity: 1;
}

.code-box .highlight-wrapper {
  display: none;
  overflow: auto;
  border-radius: 0 0 6px 6px;
}
.code-box .highlight-wrapper-expand {
  display: block;
}

.code-box .highlight {
  position: relative;
  pre {
    margin: 0;
    padding: 0;
    background: #fff;
  }
  &:not(:first-child) {
     border-top: 1px dashed @border-color-split;
  }
}

.code-box .code-box-code-copy {
  position: absolute;
  top: 10px;
  right: 12px;
  margin: 0 !important;
  font-size: 14px;
  cursor: pointer;
  color: #888;
  transition: all .24s;
  background: #fff;
  width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  border-radius: 20px;
  &:hover {
    color: @primary-color;
    transform: scale(1.2);
  }
  &.anticon-check {
    color: @green-6!important;
    font-weight: bold;
  }
}

.code-box pre {
  margin: 0;
  width: auto;
}

.code-box pre code {
  border: none;
  background: #fff;
}