css
/* CSS Stylesheet */
body {
  background-color: #f2f2f2;
  font-family: 'Open Sans', Arial, sans-serif;
  font-size: 18px;
  line-height: 24px;
  color: #000;
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 36px;
  font-weight: bold;
  margin-bottom: 10px;
  border-bottom: 4px solid #000;
  padding-bottom: 8px;
  border-top: 4px solid #000;
  padding-top: 8px;
}

h2 {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 10px;
  border-bottom: 4px solid #000;
  padding-bottom: 8px;
}

h3 {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 10px;
  border-bottom: 4px solid #000;
  padding-bottom: 8px;
}

p {
  font-size: 18px;
  line-height: 24px;
  margin-bottom: 20px;
  border-bottom: 4px solid #000;
  padding-bottom: 8px;
  color: #000;
  background: #f2f2f2;
  padding: 10px;
  border: 4px solid #000;
}

a {
  text-decoration: none;
  color: #000;
  background: #000;
  border: none;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: bold;
  margin: 4px 4px;
  transition: background 0.2s;
  background-color: #f2f2f2;
  color: #000;
}

a:hover {
  background: #000;
  text-decoration: none;
  color: #000;
  transition: background 0.2s;
}

a:visited {
  text-decoration: none;
  color: #666;
  background: #fff;
  border: none;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: bold;
  margin: 4px 4px;
  transition: background 0.2s;
  background-color: #f2f2f2;
  color: #666;
}

img {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  padding: 10px;
  border: 4px solid #000;
  background: #f2f2f2;
  padding: 10px;
  border-radius: 4px;
  box-shadow: 0 2px 4px #000;
}