body {
  font-family: Arial, sans-serif;
  background:#f5f5f5;
  margin:0;
}
header {
  background:#222; color:#fff; padding:15px;
}
nav {
  background:#444; padding:10px;
}
nav a {
  color:#fff; margin-right:15px; text-decoration:none;
}
nav a:hover { text-decoration:underline; }
.container {
  padding:20px;
}
.card {
  background:#fff;
  padding:20px;
  margin:20px auto;
  max-width:400px;
  border-radius:8px;
  box-shadow:0 2px 6px rgba(0,0,0,0.1);
}
h1,h2 { color:#333; }
label {
  display:block;
  margin-top:10px;
  color:#555;
}
input, select {
  width:100%;
  padding:10px;
  margin-top:5px;
  border:1px solid #ccc;
  border-radius:6px;
}
button {
  margin-top:15px;
  padding:10px 15px;
  background:#222;
  color:#fff;
  border:none;
  border-radius:6px;
  cursor:pointer;
}
button:hover { background:#444; }