body {
  font-family: Arial, sans-serif;
  margin: 40px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

/* Header principal */
.header {
  padding: 20px;
  text-align: center;
  background: #222;
  color: white;
}

.header h1 {
  margin: 0;
}

/* Barra de navegación */
.nav-bar {
  padding: 10px;
  background: #444;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  text-align: center;
}

nav ul li {
  display: inline;
  margin: 0 10px;
}

nav ul li a {
  color: white;
  text-decoration: none;
}

nav ul li a:hover {
  text-decoration: underline;
}

/* Columnas */
.side {
  width: 10%;
  padding: 15px;
  border: 1px solid #ccc;
  text-align: center;
}

.content {
  width: 80%;
  padding: 15px;
  border: 1px solid #ccc;
  text-align: center;
}

/* Imágenes */
img {
  max-width: 100%;
  height: auto;
}