要求 CSS/JS 默认隐藏 DIV，然后点击打开 EN

.emoji-popup {
   position: absolute;
   top: -140px;
   left: 10px;
   height: 130px;
   width: 194px;
   background: #999;
   border-radius: 2px;
   text-align: left;
   overflow-y: auto;
   opacity: 0;
   pointer-events: none;
   transition: all 0.25s;
   box-sizing: border-box;
}

.emoji-wrapper {
   overflow: hidden;
   padding: 10px;
   box-sizing: border-box;
}
.emoji-popup .emoji-img {
   margin: auto;
   width: 30px;
   height: 30px;
   text-align: center;
   border-radius: 5px;
}

.emoji-popup .emoji-img:hover {
   background: rgba(0, 0, 0, 0.25);
}