/*左边树形菜单*/
#lefttreemenu {
    position: fixed;
    /* background: #007AFF; */
    width: 450px;
    height: 500px;
}

/*右边内容*/
#rightcontent {
    /* background: #BBBBBB; */
    height: 500px;
    margin-left: 250px;
}

/*树形菜单*/
details {
    padding-left: 20px
}

summary {
    list-style: none;
}

/* summary {
    background: url(rightarrow1.png) no-repeat left;
    cursor: pointer;
    display: inline-block;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
  }

  summary::-webkit-details-marker {
    display: none;
  }

  summary:before {
    content: "";
    color: #696f7c;
    margin-right: 5px;
    padding: 10px;
  } */


summary:before {
    content: "";
    color: #696f7c;
    margin-right: 5px;
    padding: 10px;
}

summary:not(:only-child) {
    background: url("image/rightarrow1.png") 4px center no-repeat;
}

summary:only-child {
    background: url("image/point1.png") 4px center no-repeat;
}

details[open]>summary:not(:only-child) {
    background-image: url("image/downarrow1.png");
}

.tree-item:hover {
    background: #8CC38250;
    padding-left: 400px;
    margin-left: -400px;
}

.tree {
    overflow: auto;
}