body {
  font-family: 'Noto Sans JP', sans-serif;
  margin: 40px auto;
  max-width: 800px;
  line-height: 1.8;
  color: #333;
}

h1 {
  font-size: 1.8em;
  margin-bottom: 0.5em;
}

h2 {
  font-size: 1.5em;
  margin-top: 1em;
}

h3 {
  font-size: 1.2em;
  margin-top: 1.5em;
  border-left: 4px solid #4CAF50;
  padding-left: 8px;
}

a {
  color: #4CAF50;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

form {
  margin-top: 1em;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  max-width: 600px;
  padding: 8px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

textarea {
  resize: vertical;
}

button {
  background-color: #4CAF50;
  color: white;
  padding: 10px 20px;
  margin-top: 10px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #45a049;
}

footer {
  margin-top: 4em;
  text-align: center;
  color: #777;
  font-size: 0.9em;
}