body{font-family:Arial,Helvetica,sans-serif;text-align:center;margin-top:40px;background:#f7f7f7}
h1{margin-bottom:25px;font-size:1.4em}
#box{display:inline-block;background:#fff;padding:15px 25px;border-radius:8px;box-shadow:0 2px 6px rgba(0,0,0,.15)}
.stat{margin:6px 0}
.ready-ko{color:#c0392b}
.ready-ok{color:#27ae60;font-weight:bold}
#ctrl{margin-top:25px}
button{width:110px;margin:8px;padding:10px;font-size:1em;border:none;border-radius:4px;cursor:pointer}
button:disabled{background:#bdc3c7;cursor:not-allowed}
button:not(:disabled){background:#3498db;color:#fff}
button:not(:disabled):hover{background:#2980b9}