test font size newsletter

src/components/NewsLetter/NewsLetter.jsx

           <Typography variant='h4' sx={{fontWeight:"500", fontSize:"1.8rem !important", pb:2}}>
             Let's stay in touch
           </Typography>
-          <Typography variant='body1'>
+          <Typography variant='body1' sx={{fontSize:{xs:"0.875rem", sm:"0.875rem", md:"1rem" }}}>
             Enjoy 15% off your first order when you join our mailing list.
           </Typography>
           <TextField
             }}
           />
 
-          <Typography variant='body1'>
+          <Typography variant='body1' sx={{fontSize:{xs:"0.875rem", sm:"0.875rem", md:"1rem" }}}>
             We respect your privacy, so we never share your info.
           </Typography>
         </Box>