.bubble-point { position: absolute; top: 15px; left: -6px; width: 8px; height: 8px; border: 1px solid #dfdfdf; background-color: #fff; border-right: 0; border-top: 0; -webkit-transform-origin: 50% 50%; -webkit-transform: rotate(45deg); }
使用方法,父元素加position:relative;