.iu-select-option{min-height:0;min-width:0;opacity:0;-webkit-transition:all .5s;transition:all .5s}.iu-select-option.active{max-height:300px;opacity:1}.iu-select-option-list{max-height:222px;opacity:1}.iu-select-option-list::-webkit-scrollbar{width:8px}.iu-select-option-list::-webkit-scrollbar-track{background:#f1f1f1;border-radius:10px}.iu-select-option-list::-webkit-scrollbar-thumb{background:#999;border-radius:10px}.iu-select-option-list::-webkit-scrollbar-thumb:hover{background:#555}