#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50}nav{padding:30px}nav a{font-weight:700;color:#2c3e50}#formula_input{width:30%;margin:6px}#formula_submit{width:5%;margin:6px}#formula_show{margin:10px;font-size:20px}.true_table{margin:0 auto}.true_table,.true_table td,.true_table th{text-align:center;border-bottom:1px solid #a19f9f}.true_table td,.true_table th{padding:0 10px}