.dd-core-llm-chat .sidebar-header .title {
  margin-top: 0px;
  background-size: 100px auto;
  background-image: url(/content/image/bnu-logo.png);
  padding-top: 100px;
  background-repeat: no-repeat;
  background-position: center top;
  font-size: 18px;
  text-align: center;
}
.dd-core-llm-chat .hello .title {
  margin-top: 40px;
  background-size: 200px auto;
  background-image: url(/content/image/bnu-logo.png);
  padding-top: 200px;
  background-repeat: no-repeat;
  background-position: center top;
}