[questions][ui] Minor UI cleanup (#470)

* [questions][ui] fix no more questions overlap

* [questions][ui] remove redundent horizontal div

* [questions][ui] reduce gap

apps/portal/src/components/questions/ContributeQuestionDialog.tsx

@@ -35,13 +35,7 @@ export default function ContributeQuestionDialog({
   return (
     <div>
       <Transition.Root as={Fragment} show={show}>
-        <Dialog
-          as="div"
-          className="relative z-10"
-          onClose={() => {
-            // Todo: save state
-            onCancel();
-          }}>
+        <Dialog as="div" className="relative z-10" onClose={onCancel}>
           <Transition.Child
             as={Fragment}
             enter="ease-out duration-300"

apps/portal/src/components/questions/forms/ContributeQuestionForm.tsx

@@ -115,7 +115,6 @@ export default function ContributeQuestionForm({
           rows={5}
           {...register('questionContent')}
         />
-        <HorizontalDivider />
         <h2 className="text-md text-primary-800 font-semibold">
           Additional information
         </h2>