import CssBaseline from "@material-ui/core/CssBaseline";
import MuiThemeProvider from "@material-ui/core/styles/MuiThemeProvider";
import * as React from "react";

import { Provider as DateProvider } from "../components/Date/DateContext";
import { FormProvider } from "../components/Form";
import { MessageManager } from "../components/messages";
import { TimezoneProvider } from "../components/Timezone";
import theme from "../theme";

export const Decorator = storyFn => (
  <FormProvider>
    <DateProvider value={+new Date("2018-08-07T14:30:44+00:00")}>
      <TimezoneProvider value="America/New_York">
        <MuiThemeProvider theme={theme}>
          <CssBaseline />
          <MessageManager>
            <div
              style={{
                padding: 24
              }}
            >
              {storyFn()}
            </div>
          </MessageManager>
        </MuiThemeProvider>
      </TimezoneProvider>
    </DateProvider>
  </FormProvider>
);
export default Decorator;

import CssBaseline from "@material-ui/core/CssBaseline";
import MuiThemeProvider from "@material-ui/core/styles/MuiThemeProvider";
import * as React from "react";

import { Provider as DateProvider } from "../components/Date/DateContext";
import { FormProvider } from "../components/Form";
import { MessageManager } from "../components/messages";
import { TimezoneProvider } from "../components/Timezone";
import theme from "../theme";

export const Decorator = storyFn => (
  <FormProvider>
    <DateProvider value={+new Date("2018-08-07T14:30:44+00:00")}>
      <TimezoneProvider value="America/New_York">
        <MuiThemeProvider theme={theme}>
          <CssBaseline />
          <MessageManager>
            <div>{storyFn()}</div>
          </MessageManager>
        </MuiThemeProvider>
      </TimezoneProvider>
    </DateProvider>
  </FormProvider>
);
export default Decorator;

--- 
+++ 
@@ -15,7 +15,13 @@
         <MuiThemeProvider theme={theme}>
           <CssBaseline />
           <MessageManager>
-            <div>{storyFn()}</div>
+            <div
+              style={{
+                padding: 24
+              }}
+            >
+              {storyFn()}
+            </div>
           </MessageManager>
         </MuiThemeProvider>
       </TimezoneProvider>
Add padding to the story decorator
