body { font-family: Arial; background: #f0f0f0; margin:0; padding:0; }
main { padding: 20px; max-width: 900px; margin: 40px auto; background: #fff; border-radius: 8px; box-shadow: 0 0 10px #ccc; }
input, select, textarea { display: block; width: 100%; margin: 8px 0; padding: 10px; border: 1px solid #ccc; border-radius: 4px; }
button { padding: 10px 20px; margin-top: 10px; background: #2e8b57; color: white; border: none; border-radius: 5px; cursor: pointer; }
header { background: #2e8b57; color: white; padding: 10px 20px; border-radius: 8px 8px 0 0; }
nav button { background: #256f46; margin: 5px 5px 0 0; }
.aba { margin-top: 20px; }