body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  margin: 0;
  padding: 0;
}

main {
  max-width: 800px;
  margin: 20px auto;
  padding: 20px;
  background: #ffffff;
}

h1 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 20px;
}

h2 {
  font-size: 1.5rem;
  margin-top: 20px;
  margin-bottom: 10px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 15px;
  margin-bottom: 5px;
}

p {
  margin: 10px 0;
}

ul, ol {
  margin: 10px 0 20px 20px;
}

li {
  margin-bottom: 5px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 10px auto;
}

figcaption {
  text-align: center;
  font-size: 0.9rem;
  margin-bottom: 15px;
}

form {
  margin-top: 20px;
}

fieldset {
  margin: 15px 0;
  padding: 10px;
}

legend {
  font-weight: bold;
}

label {
  margin-right: 10px;
}

input[type="text"] {
  width: 100%;
  padding: 5px;
  margin-top: 10px;
  margin-bottom: 10px;
}

button {
  padding: 8px 15px;
}

footer {
  text-align: center;
  margin: 20px 0;
  font-size: 0.9rem;
}