vanillaSelectBox.css

.hidden-search {
	display: none !important;
}


li[data-parent].closed{
	display:none !important;
}

li[data-parent].open:not(.hidden-search){
	display:block !important;
}

.vsb-menu{
  cursor:pointer;
  z-index:1000;
	display:block;
	visibility: hidden;
  position:absolute;/*Don't change*/
  border:1px solid #B2B2B2;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid rgba(0,0,0,.15);
  box-shadow: 0 6px 12px rgba(0,0,0,.175);
  border-radius:4px;
  font-size : 11px;
}

.vsb-js-search-zone{
	position:absolute;/*Don't change*/
    z-index:1001;
	width: 80%;
	min-height:1.8em;
	padding: 2px;
	background-color: #fff;
}

.vsb-js-search-zone input{
	border: 1px solid grey;
	margin-left: 2px;
	width: 96%;
	border-radius: 4px;
	height: 25px !important;
}

.vsb-main{
	position: relative;/*Don't change*/
	display: inline-block;
	vertical-align: middle;
	text-align:left;
}

.vsb-menu li:hover {
	background: linear-gradient(#f5f5f5, #e8e8e8);
}

.vsb-menu ul{
	user-select:none;
	list-style:none;
	white-space: nowrap;
	margin:0px;
	margin-top:4px;
	padding-left:10px;
	padding-right:10px;
	padding-bottom:3px;
	color: #333;
	cursor:pointer;
	overflow-y:auto;
}