Код:
#chatUserMiniMenu { text-shadow: 0px 1px 0 #000; background-color: transparent; background-image: url("https://s8.hostingkartinok.com/uploads/images/2017/09/7f98a0f5a06d4fab29511ce06bc75ed7.gif "); background-position: right 0 bottom 0; background-repeat: no-repeat; background-size: 150% auto; border: 2px solid #fff; border-radius: 8px; box-shadow:1px 1px 6px #000,-1px -1px 1px #fff; }