Return some button styling to fix button display on simptom edit

components/common/button.js

@@ -58,11 +58,12 @@ const textSmall = {
 }
 
 const button = {
+  alignItems: 'center',
   alignSelf: 'center',
   flexDirection: 'row',
   justifyContent: 'center',
   marginTop: Spacing.base,
-  paddingHorizontal: Spacing.base,
+  paddingHorizontal: Spacing.tiny,
   minWidth: '15%'
 }