修改element-ui里table中悬浮框中三角号的颜色及透明度设置

.el-tooltip__popper,.el-tooltip__popper.is-dark{background:rgba(0,0,0,0.6) !important;}
.el-tooltip__popper[x-placement^=top] .popper__arrow {
        border-top-color: rgba(0,0,0,0.4);
}
.el-tooltip__popper[x-placement^=top] .popper__arrow:after {
        border-top-color: rgba(0,0,0,0.4);
        /*filter:alpha(opacity=50);
        -moz-opacity:0.5;
        -khtml-opacity: 0.5;
        opacity: 0.5;*/
}