.si-op-chip { position: relative; display:inline-block; }
.si-chip-btn{ padding:10px 14px; border:1px solid #222; background:#fff; cursor:pointer; }
.si-op-menu{ display:none; position:absolute; top:100%; left:0; background:#fff; border:1px solid #ddd; z-index:9999; }
.si-op-menu button{ padding:10px 14px; width:100%; border:0; background:#fff; text-align:left; cursor:pointer; }
.si-op-menu button:hover{ background:#f2f2f2; }
.si-op-chip.si-open .si-op-menu{ display:block; }