.comments-tree {
  position: relative;
  margin-right: 0;
}
#pinned-message {
  position: absolute;
  min-width: 100%;
  max-width: 100%;
}
#pinned-message label {
  display: block;
  min-width: 100%;
  max-width: 100%;
  padding: 5px 10px;
  background: #eec6ff; /* Фон закреплённого сообщения */
  cursor: pointer;
}
#pinned-message input + div {
  font-weight: bold;
}
#pinned-message .pinned-text {
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  max-height: 1.55em;
  max-width: calc(100% - 100px);
  transition: max-height 1s;
}
#pinned-message input:checked ~ .pinned-text {
  overflow: hidden;
  white-space: normal;
  max-height: 700px;
  max-width: calc(100% - 100px);
}
#pinned-message input,
#pinned-close-cb {
  display:none;
}
.pinned-close {
  cursor: pointer;
  padding: 0 5px;
  position: absolute;
  z-index: 1;
  right: 15px;
  top: 16px;
  opacity: .3;
}
#pinned-close-cb:not(:checked) ~ #pinned-message,
#pinned-close-cb:not(:checked) ~ .pinned-close,
#pinned-close-cb:not(:checked) ~ .comments-container .pinned-filler {
  display: none;
}
.pinned-filler {
  height: 60px;
}