style.css

body {
  padding: 15px;
}

.pure-menu .pure-menu-heading {
  font-size: 120%;
}

#content {
  display: inline-block;
  min-width: 72%;
  height: 97%;
  margin-left: 30px;
}

#div-menu {
  display: inline-block;
  vertical-align: top;
}

#div-menu h1 {
  text-align: center;
}

iframe {
  width: 100%;
  height: 100%;
  margin: 0px;
  padding: 0px;
  border-style: none;
}