.custom-combobox {
     position: relative;
     display: inline-block;
 }

 .custom-combobox-toggle {
     position: absolute;
     top: 0;
     bottom: 0;
     margin-left: -1px;
     padding: 0;
 }

 .custom-combobox-input {
     margin: 0;
     padding: 5px 10px;
 }

 .custom-combobox-scrollable-menu {
     max-height: 150px;
     overflow-y: auto;
     overflow-x: hidden;
 }

 .ui-autocomplete {
     z-index: 2147483647 !important;
 }