Javascript 如何使用CSS的before属性将箭头添加到MI Popover?
我有一件府绸:Javascript 如何使用CSS的before属性将箭头添加到MI Popover?,javascript,css,material-design,material-ui,css-shapes,Javascript,Css,Material Design,Material Ui,Css Shapes,我有一件府绸: <Popover id={id} open={openMe} anchorEl={anchorEl} className={classes.popover} onClose={handleCloseMe} anchorOrigin={{ vertical: 'bottom', horizontal: 'center', }} transformOrigin={{ vertic
<Popover
id={id}
open={openMe}
anchorEl={anchorEl}
className={classes.popover}
onClose={handleCloseMe}
anchorOrigin={{
vertical: 'bottom',
horizontal: 'center',
}}
transformOrigin={{
vertical: 'top',
horizontal: 'center',
}}
>
<Typography className={`${classes.popover} ${classes.typography}`}>
... Some contents
</Typography>
</Popover>
如何将箭头添加到材质UI的Popover类
.arrow-up {
width: 0;
height: 0;
border-left: 15px solid transparent;
border-right: 15px solid transparent;
border-bottom: 15px solid black;
}