.dropdown-tree {
    display: none; 
    float: left;
    font-size: 12px;
    left: 0px;
    position: absolute;
    text-shadow: none;
    top: 100%;
    z-index: 1000;
    box-shadow: rgba(86, 96, 117, 0.3) 0px 0px 3px;
    border-width: medium;
    border-style: none;
    border-color: initial;
    border-image: initial;
    list-style: none outside none;
    padding: 0px;
    border-radius: 0px;
    text-align: left;
 	background-color: rgb(255, 255, 255);
 	background-clip: padding-box;
 	margin: 2px 0px 0px;
 	min-width: 160px;
 	top: 34px; 
 	left: 15px; 
 	max-height: 240px; 
 	overflow-y: auto;
}