drag and drop width fix (#279)

Author: trean

src/components/Uploader/StyledDragDrop.jsx

@@ -3,6 +3,7 @@ import { styled } from '@mui/material/styles';
 
 export const StyledDragDrop = styled(DragDrop)(({ theme }) => ({
   '& .uppy-DragDrop-container': {
+    width: '100%',
     backgroundColor: theme.palette.background.paper,
     color: theme.palette.text.primary,
   },