Removed additional, optional and slide material links at bottom

Ravi Srinivasan

2019-01-14 26420c8d1b60c7c124e48a6ecfc101f5caf5ad06

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p.tip {
  border-left-color: #f66;
}
p.tip:before {
  content: "!";
  background-color: #f66;
}
 
/* iframe { height: -webkit-fill-available; } */