body { font-family: Arial, sans-serif; background: #f4f4f4; margin: 0; padding: 0; }
.container { max-width: 600px; margin: 50px auto; background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
h1, h2 { text-align: center; }
input, button { width: 100%; padding: 10px; margin: 10px 0; border: 1px solid #ddd; border-radius: 4px; }
button { background: #007bff; color: #fff; border: none; cursor: pointer; }
button:hover { background: #0056b3; }
.btn-danger { background: #dc3545; }
.btn-danger:hover { background: #bd2130; }
pre { background: #f8f9fa; padding: 15px; border-radius: 4px; overflow-x: auto; }
img { max-width: 100%; height: auto; }