Fix invisible adornments

src/components/Timeline/Timeline.tsx

@@ -30,6 +30,9 @@ const styles = (theme: Theme) =>
       "& > div": {
         padding: "0 14px"
       },
+      "& fieldset": {
+        background: theme.palette.background.paper
+      },
       "& textarea": {
         "&::placeholder": {
           opacity: [[1], "!important"] as any

src/theme.ts

@@ -281,8 +281,7 @@ export default (colors: IThemeColors): Theme =>
           "& fieldset": {
             "&&:not($error)": {
               borderColor: colors.input.border
-            },
-            background: colors.background.paper
+            }
           },
           "& legend": {
             display: "none"