.knowcess {
  display: flex;
  flex-direction: column;
  position: relative;
  max-height: 90vh;
  overflow: hidden;
}

.knowcess-source {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: #2d2d2d;
}

.knowcess-source .knowcess-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  margin-top: 10px; /* same .knowcess-code padding-top */
  background: rgba(255, 255, 255, 0.2);
  z-index: 1;
  line-height: 1.5; /* same .knowcess-code line-height */
  font-size: 1em; /* same .knowcess-code font-size */
  opacity: 0;
}

.knowcess-source .knowcess-line::before {
  font-size: 1em;
  content: '33';
  color: transparent;
}

.knowcess-source .knowcess-code {
  padding: 10px;
  position: relative;
}

.knowcess-source .knowcess-code pre[class*='language-'] {
  margin: 0px;
  padding: 0px;
}

.knowcess-interactive {
  display: flex;
  flex-direction: column;
  background: #f1f1f1;
}

.knowcess-stacks {
  display: flex;
  flex-direction: column;
}

.knowcess-stacks .knowcess-stacks-item {
  display: flex;
  border-bottom: 1px solid #fff;
}

.knowcess-stacks .knowcess-stacks-label {
  box-sizing: border-box;
  width: 6rem;
  height: 35px;
  line-height: 35px;
  padding: 0px 5px;
  background: #ddd;
}

.knowcess-stacks .knowcess-stacks-value {
  box-sizing: border-box;
  flex: 1;
  height: 35px;
  line-height: 35px;
  padding: 0px 5px;
  background: #f1f1f1;
  overflow-x: auto;
  white-space: nowrap;
}

.knowcess-stacks .knowcess-stacks-value span {
  display: inline-block;
  position: relative;
  box-sizing: border-box;
  height: 26px;
  line-height: 26px;
  background: #ddd;
  padding: 0px 5px;
  margin-right: 5px;
  white-space: nowrap;
  opacity: 0;
}

.knowcess-action {
  display: flex;
  justify-content: space-between;
  background: #ddd;
  padding: 5px;
}

.knowcess-action span {
  cursor: pointer;
}

.knowcess-action span svg {
  vertical-align: middle;
}

.knowcess-action .knowcess-action-play {
  display: block;
}

.knowcess-action .knowcess-action-pause {
  display: none;
}

.knowcess-commentary {
  width: 80%;
  background: rgba(0, 0, 0, 0.77);
  border-radius: 7px;
  padding: 1em;
  color: #fff;
  position: absolute;
  left: 50%;
  top: 50%;
  font-size: 1.5rem;
  transform: translate(-50%, -50%);
  line-height: 1.5;
  opacity: 0;
}

/* horizontal layout */
.knowcess-horizontal {
  flex-direction: row;
}

.knowcess-horizontal .knowcess-source {
  flex: 2;
}

.knowcess-horizontal .knowcess-interactive {
  flex: 1;
  overflow: hidden;
}

.knowcess-horizontal .knowcess-stacks {
  flex: 1;
  overflow-y: auto;
}

.knowcess-horizontal .knowcess-stacks .knowcess-stacks-item {
  flex-direction: column;
}

.knowcess-horizontal .knowcess-stacks .knowcess-stacks-label {
  width: 100%;
}

.knowcess-horizontal .knowcess-stacks .knowcess-stacks-value {
  display: flex;
  flex-direction: column-reverse;
  max-height: calc(90vh - 35px - 42px);
  overflow-y: auto;
}

.knowcess-horizontal .knowcess-stacks .knowcess-stacks-value span {
  display: block;
  margin: 5px 0px;
}