sci-pro/es/src/tree/style/index.css

.sci-tree {
  font-size: 14px;
  color: #606266;
}
.sci-tree .sci-tree_title {
  display: flex;
  align-items: center;
  height: 20px;
}
.sci-tree .sci-tree_title:hover {
  cursor: pointer;
  background-color: #f5f7fa;
}
.sci-tree .sci-tree_title div {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}
.sci-tree .sci-tree_title .item-title_icon {
  display: inline-block;
  width: 5px;
  height: 5px;
  border: 1px solid #7c7c7c;
  border-bottom-color: transparent;
  border-left-color: transparent;
  transition: all 0.2s ease;
  transform: rotate(45deg);
}
.sci-tree .sci-tree-children {
  padding-left: 12px;
  overflow: hidden;
}