html, body {
  margin: 0;
  padding: 0;
  position: fixed;
}

button {
  background-color: gray;
  position: fixed;
  font-family: Arial; 
  font-size: 10pt;
  height: 20px;
}

iframe {
  scroll-behavior: auto;
 
}

/* unvisited link */
a:link {
  color: gray;
  text-decoration: none;
}

/* visited link */
a:visited {
  color: gray;
  text-decoration: none;
}

/* mouse over link */
a:hover {
  color: gray;
  cursor:pointer;
  text-decoration: none;
}

/* selected link */
a:active {
  color: gray;
  text-decoration: none;
}