fix: removed unused style file (#406)

src/App/styles.ts

@@ -1,18 +0,0 @@
-import { css } from '@emotion/core';
-
-import { theme } from '../design-tokens/theme';
-
-export const alertError = css({
-  backgroundColor: `${theme.palette.red} !important`,
-  minWidth: 'inherit !important',
-});
-
-export const alertErrorMsg = css({
-  display: 'flex',
-  alignItems: 'center',
-});
-
-export const alertIcon = css({
-  opacity: 0.9,
-  marginRight: '8px',
-});