header img,
footer img {
  margin: 0 0 0 0;
  max-width: 50px;
}

img.thumbnail {
  max-width: 10%;
  width: 100px;
  display: block;
  clear: both;
}

img {
  max-width: 95%;
  height: auto;
  margin: 5px 0 5px 5px;
  display: block;
  clear: both;
}

img.hidden {
  display: none;
}