body { font-family: Arial, sans-serif; max-width: 900px; margin: 20px auto; }
header { display: flex; justify-content: space-between; align-items: center; }
nav a { margin-right: 10px; }
label { display:block; margin-top:10px; }
input, select, button { padding:8px; margin-top:5px; }
button { cursor:pointer; }