silverstripe-framework/css/TreeDropdownField.css

div.TreeDropdownField { width: 400px; background: #fff; border: 1px solid #aaa; cursor: pointer; overflow: hidden; }
div.TreeDropdownField input { border: none; background: none; padding: 0; margin: 0; }
div.TreeDropdownField .treedropdownfield-title { float: left; padding: 7px; width: 90%; line-height: 16px; overflow: hidden; outline: none; }
div.TreeDropdownField .treedropdownfield-panel { clear: left; position: absolute; overflow: auto; display: none; cursor: default; border: 1px solid #aaa; border-top: none; margin: 1px 0 0 -1px; /* account for border on container div */ height: 200px; background-color: #fff; z-index: 50; -webkit-box-shadow: 0 4px 5px rgba(0, 0, 0, 0.15); -moz-box-shadow: 0 4px 5px rgba(0, 0, 0, 0.15); -o-box-shadow: 0 4px 5px rgba(0, 0, 0, 0.15); box-shadow: 0 4px 5px rgba(0, 0, 0, 0.15); }
div.TreeDropdownField .treedropdownfield-panel ul.tree { margin: 0; }
div.TreeDropdownField .treedropdownfield-panel ul.tree a { font-size: 12px; }
div.TreeDropdownField .treedropdownfield-toggle-panel-link { border: none; margin: 0; z-index: 0; padding: 7px 3px; float: right; overflow: hidden; -webkit-border-radius: 0 4px 4px 0; -moz-border-radius: 0 4px 4px 0; border-radius: 0 4px 4px 0; -moz-background-clip: padding; -webkit-background-clip: padding-box; background-clip: padding-box; background: #ccc; background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0, #cccccc), color-stop(0.6, #eeeeee)); background-image: -webkit-linear-gradient(center bottom, #cccccc 0%, #eeeeee 60%); background-image: -moz-linear-gradient(center bottom, #cccccc 0%, #eeeeee 60%); background-image: -o-linear-gradient(bottom, #cccccc 0%, #eeeeee 60%); background-image: -ms-linear-gradient(top, #cccccc 0%, #eeeeee 60%); filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#cccccc', endColorstr='#eeeeee',GradientType=0 ); background-image: linear-gradient(top, #cccccc 0%, #eeeeee 60%); border-left: 1px solid #aaa; }
div.TreeDropdownField .treedropdownfield-toggle-panel-link.treedropdownfield-open-tree { background: transparent; border: none; }
div.TreeDropdownField .treedropdownfield-toggle-panel-link a { text-decoration: none; display: block; border: 0; margin: 0; opacity: 0.5; }
div.TreeDropdownField .loading, div.TreeDropdownField .jstree-themeroller a.jstree-loading .jstree-icon { background: white url("../images/network-save.gif") center center no-repeat !important; }