#app{font-family:PT Sans,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50;margin-top:60px;width:300px;margin:auto}#display{background-color:#181717;color:#faebd7;text-align:end;width:250px;padding:20px;height:34px;margin-left:5px;margin-bottom:2px;font-size:30px}.button{display:inline-block;width:95px;padding-top:20px;padding-bottom:20px;background-color:#2f4f4f;color:#fff;margin:1px}.button:hover{background-color:#b8860b}.double{width:192px}