primereact/components/tree/Tree.css

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.ui-tree {
    width: 18em;
}

.ui-tree .ui-treenode-selectable.ui-treenode-content {
    cursor: pointer;
}

.ui-tree .ui-tree-container {
    height: 100%;
    margin: 0;
    overflow: auto;
    padding: .25em;
    white-space: nowrap;
}

.ui-tree .ui-treenode-children {
    margin: 0;
    padding: 0 0 0 1em;
}

.ui-tree .ui-treenode {
    background-attachment: scroll;
    background-color: transparent;
    background-image: none;
    background-position: 0 0;
    background-repeat: repeat-y;
    list-style: none outside none;
    margin: 0;
    padding: .125em 0 0 0;
}

.ui-tree .ui-treenode-droppoint {
    height: 4px;
    list-style-type: none;
}

.ui-tree .ui-treenode-droppoint-active {
    border: 0 none;
}

.ui-tree .ui-tree-toggler {
    cursor: pointer;
    display: inline-block;
    vertical-align: middle;
}

.ui-tree .ui-treenode-icon {
    display: inline-block;
    vertical-align: middle;
}

.ui-tree .ui-treenode-label {
    display: inline-block;
    padding: 0 .25em;
    vertical-align: middle;
}

.ui-tree .ui-treenode-label.ui-state-hover,
.ui-tree .ui-treenode-label.ui-state-highlight {
    font-weight: normal;
    border: 0 none;
}

.ui-tree .ui-treenode.ui-treenode-leaf > .ui-treenode-content > .ui-tree-toggler {
    visibility: hidden;
}

.ui-tree .ui-chkbox-box {
    cursor: pointer;
}

.ui-tree .ui-chkbox {
    display: inline-block;
    vertical-align: middle;
}

.ui-tree .ui-chkbox .ui-chkbox-icon {
    margin-left: 1px;
}

/** Fluid **/
.ui-fluid .ui-tree {
    width: 100%;
}

/** Horizontal Tree **/
.ui-tree-horizontal {
    width:auto;
    padding: .5em 0;
    overflow:auto;
}

.ui-tree.ui-tree-horizontal table,
.ui-tree.ui-tree-horizontal tr,
.ui-tree.ui-tree-horizontal td {
    border-collapse: collapse;
    margin: 0;
    padding: 0;
    vertical-align: middle;
}

.ui-tree.ui-tree-horizontal .ui-tree-toggler {
    vertical-align: middle;
    margin: 0;
}

.ui-tree-horizontal .ui-treenode-content {
    font-weight: normal;
    padding: 0.4em 1em 0.4em 0.2em;
}

.ui-tree.ui-tree-horizontal .ui-tree-node-label {
    margin: 0;
}

.ui-tree-horizontal .ui-treenode-parent .ui-treenode-content {
    font-weight: normal;
    white-space: nowrap;
}

.ui-tree.ui-tree-horizontal .ui-treenode {
    background: url("./images/line.gif") repeat-x scroll center center transparent;
    padding: .25em 2.5em;
}

.ui-tree.ui-tree-horizontal .ui-treenode.ui-treenode-leaf,
.ui-tree.ui-tree-horizontal .ui-treenode.ui-treenode-collapsed {
    padding-right: 0;
}

.ui-tree.ui-tree-horizontal .ui-treenode-children {
    padding: 0;
    margin: 0;
}

.ui-tree.ui-tree-horizontal .ui-treenode-connector {
    width: 1px;
}

.ui-tree.ui-tree-horizontal .ui-treenode-connector-table {
    height: 100%;
    width: 1px;
}

.ui-tree.ui-tree-horizontal .ui-treenode-connector-line {
    background: url("./images/line.gif") repeat-y scroll 0 0 transparent;
    width: 1px;
}

.ui-tree.ui-tree-horizontal table {
	height: 0;
}

.ui-tree.ui-tree-horizontal .ui-chkbox {
    vertical-align: bottom;
    margin-right: .25em;
}