@import"https://fonts.googleapis.com/css?family=Space+Mono";body{background:gray;margin:0;font-family:Space Mono,monospace}*{box-sizing:border-box}.calculator{max-width:320px;background:#eee}#content-setting{align-items:center;justify-content:center;display:flex;margin:0 auto;padding-top:120px}.calculator-buttons{display:grid;grid-template-columns:repeat(4,1fr);border:0}.calc-numbers{font-family:Space Mono,serif;background:#000;color:#fff;font-size:2em;border:0;padding:.3em;text-align:right;width:100%;height:100px}.span-2{grid-column:span 2}.span-3{grid-column:span 3}.btn{font-size:1em;height:65px;border:1px solid black;cursor:pointer}.btn:hover{background:#fff}.orange{background-color:orange}