:root{font-family:sans-serif;background-color:#222;color:#fff;text-align:center}*{outline:none}input,button{background-color:#fff1;color:#fff;border:none;border-radius:5px;padding:5px;margin-bottom:10px;width:10rem}button{cursor:pointer}header#app_currentProblem{font-size:3rem;font-family:monospace;margin-bottom:20px}header#app_currentProblem span{font-weight:700}input#app_answerInput{font-size:2rem;width:5rem;text-align:center}footer#app_score{position:fixed;bottom:0;left:0;right:0;background-color:#fff1;padding:5px;font-family:monospace;font-size:1.5rem;letter-spacing:2px}div#app_isCorrect[correct=yes]{color:green}div#app_isCorrect[correct=no]{color:red}