score:0

    const theme = createTheme({
        palette: {
          background: {
            paper: '#EFF7FF', // your color
          },
        },
      });

score:1

<Card className={classes.card}>
  <CardContent style={{backgroundColor: "red"}}>
    Your card content..
  </CardContent>

</Card>

score:1

<Card style={{backgroundColor: "red"}}></Card>

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