html,body{height:100%;font-family:Noto Sans JP,sans-serif;margin:0;padding:0;overflow-x:hidden}.game-container{max-width:800px;margin:0 auto;padding:2rem}.number-display{font-size:8rem;font-weight:700;margin:2rem 0;min-height:12rem;display:flex;align-items:center;justify-content:center}.answer-input{margin:2rem 0}.digit-button{font-size:1.5rem;min-width:4rem;height:4rem;margin:.25rem}.action-button{margin:.5rem;min-width:10rem}