.popbox {
    position: relative;
}

.popbox a.open {
    display: inline-block;
    width: auto;
}

.popbox .collapse {
    position: relative;
}

.popbox .box {
    display: none;
    background: #FFF;
    border: solid 1px #BBBBBB;
    border-radius: 5px;
    box-shadow: 0 0 15px #999;
    padding: 10px;
    position: absolute;
    /* 13px from 11px border on .arrow + 1px left on .arrow + 1px border  */
    left: calc(50% - 13px);
    z-index: 200;
}

.popbox .arrow {
    width: 0;
    height: 0;
    border-left: 11px solid transparent;
    border-right: 11px solid transparent;
    border-bottom: 11px solid #FFF;
    position: absolute;
    left: 1px;
    top: -10px;
    z-index: 1001;
}

.popbox .arrow-border {
    width: 0;
    height: 0;
    border-left: 11px solid transparent;
    border-right: 11px solid transparent;
    border-bottom: 11px solid #BBBBBB;
    position: absolute;
    top: -12px;
    z-index: 1000;
}

.popbox .title {
    padding: 8px 14px;
    margin: 0;
    font-size: 14px;
    font-weight: bold;
    line-height: 18px;
    background-color: #ffffff;
    border-bottom: 1px solid #f2f2f2;
    border-radius: 5px 5px 0 0;
    white-space: nowrap;
}