body {
  background-color: #ffff99;
  h1 {
  color: Red;
  text-align: center;
}

strong {
  font-size: 16px;
}

.bg_green {
  background-color: green;
}

.spec {
  background-color: red;
  font-size: 16px;
  font-weight: bold;
}

.kod {
  font-family: "Courier New", Courier;
}

a {
  color: #666666;
  font-size: 16px;
  text-decoration: none;
}

a:hover {
  text-decoration: underline overline;
}