.tree-overflow .el-tree{
    background-color: #fff;
    position: absolute;
    z-index: 999;
    min-width: 100%;
}
.tree-box {
    min-width: 320px;
    height: 420px;
    overflow-y: auto;
    border: 1px solid #ececec;
    background-color: #fff;
    position: absolute;
    top: 56px;
    left: 0px;
    z-index: 999;
}
.treebox{
    width: 99%;
}


.event-details-form .el-form-item--mini.el-form-item, .el-form-item--small.el-form-item{
    margin-bottom: 5px;
}