canvas{max-width: 100%; height: auto;}          

#user_answer_id{
    position: absolute;
    background-color: #fff;    
    font-weight: 800;
    font: bold 20px Arial, 'MyriadPro', sans-serif;
    color:#000;    
    text-align: center;
   left: 334px;
    top: 225px;
    width: 41px;
    height: 35px;
}