body{font-family:Arial;margin:40px}.container{max-width:900px;margin:auto}.center{text-align:center}.date{font-size:2.2em;margin:15px 0}.converter{margin-top:40px;padding-top:20px;border-top:1px solid #ccc}input,button{font-size:1em;padding:6px 10px;margin:5px}