@include b(popover) {
    font-size: 12px;
    color: #666;
    padding: 8px 16px;
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.2);
    line-height: 1.5;
    .el-button+.el-button {
        margin-left: 0px;
    }
}