body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
  margin: 40px;
}

h1 {
  font-size: 28px;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
}

nav {
  margin: 20px 0;
}

button {
  background: #e0e0e0;
  border: 1px solid #999;
  padding: 5px 10px;
  margin: 3px;
  cursor: pointer;
}

button:hover {
  background: #d0d0d0;
}

#contenedor-articulos article {
  background: #ffffff;
  border: 1px solid #ccc;
  padding: 15px;
  margin-bottom: 15px;
}

img {
  max-width: 100%;
  margin: 10px 0;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}