title{font-size:25px;margin:10px;font-family:Meiryo,serif}div.problem-info{border:1px solid #fff;border-radius:5px;padding:10px;width:60vw}div.problem-info h3{margin-top:5px}.date{font-size:.8rem;font-style:italic;color:gray}.difficulty{font-size:.8rem;font-style:italic;font-weight:700;padding:5px 10px;color:#fff;border-radius:3px}span.difficulty.d-easy{background-color:#c03a3a}span.difficulty.d-normal{background-color:#439ee1}span.difficulty.d-hard{background-color:#be4cea}span.difficulty.d-experimental,span.difficulty.d-unknown{background-color:#3f3f3f}