#page {
  margin: 0 auto;
  width: 800px;
  padding: 50px 20px;
  clear: both;
}

@media all and (max-width: 800px) {
  #page { width: 100%; }
}



.demonstrations { float: left; clear: both; width: 100%; margin-bottom: 18px; }
.demonstrations a {
  float: left;
  width: 100px;
  height: 100px;
  margin: 0 10px 10px 0;
  cursor: pointer;
}
.demonstrations a img { float: left; }
.demonstrations .rightmost { margin-right: 0; }