Unify the class name and id name. (Please correct any other mismatches between the class name and ID name.)
Before (Just an example)
<input class="input" id="input-tag" type="text" placeholder="Input your answer and then press enter button" />
<button class="input" id="answer-btn" >Enter</button>
After
<input class="input-tag" id="input-tag" type="text" placeholder="Input your answer and then press enter button" />
<button class="enter-btn" id="enter-btn" >Enter</button>
I missed it in yesterday's review. sorry.
answer-btn
toenter-btn
Before (Just an example)
After