jitsi-meet/css/_jitsi_popover.scss

.jitsipopover {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1010;
    display: none;
    max-width: 300px;
    min-width: 100px;
    text-align: left;
    color: $popoverFontColor;
    background-color: $popoverBg;
    background-clip: padding-box;
    border-radius: 3px;
    /*-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);*/
    /*box-shadow: 0 5px 10px rgba(0, 0, 0, 0.4);*/
    white-space: normal;
    margin-top: -$popoverMenuPadding;

    &__menu-padding {
        height: $popoverMenuPadding;
        width: 100px;
        position: absolute;
        bottom: -$popoverMenuPadding;
    }

    &__showmore {
        display: block;
        text-align: center;
        width: 90px;
        margin: 10px auto;
    }

    > .arrow {
        position: absolute;
        display: block;
        left: 50%;
        bottom: -5px;
        margin-left: -5px;
        width: 0;
        height: 0;
        border-color: transparent;
        border-top-color: $popoverBg;
        border-style: solid;
        border-width: 5px;
        border-bottom-width: 0;
    }
}