body {
  font-family: 'Open Sans', sans-serif;
  background: linear-gradient(#fffcee, #e3f6fd);
  color: #333;
  margin: 0;
  padding: 20px;
  text-align: center;
}

h1, h2, h3 {
  font-family: 'Source Serif Pro', serif;
  color: #457fca;
  margin-bottom: 10px;
}

h1 {
  font-size: 2.5em;
}

h2 {
  font-size: 1.8em;
  color: #6794c9;
}

h3 {
  font-size: 1.5em;
  color: #7a6ad4;
}

img {
  border-radius: 10px;
  margin: 15px 0;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

iframe {
  margin: 20px auto;
  border: none;
  border-radius: 8px;
  box-shadow: 0 0 12px rgba(0,0,0,0.15);
}

footer {
  margin-top: 30px;
  padding: 20px;
  background-color: #f7f9fc;
  font-style: italic;
  font-size: 1em;
  color: #666;
}