jitsi-meet/css/_participants-count.scss

.participants-count {
    background: #fff;
    border-radius: 4px;
    color: #5e6d7a;
    cursor: pointer;
    display: inline-block;
    font-size: 13px;
    line-height: 20px;
    margin-left: 16px;
    padding: 4px 8px;
    pointer-events: auto;

    &-number {
        margin-right: 8px;
        vertical-align: middle;
    }

    &-icon {
        background: url('../images/user-groups.svg');
        background-repeat: no-repeat;
        display: inline-block;
        height: 16px;
        width: 16px;
        vertical-align: middle;
    }
}