.fixed {
  position: fixed;
  top: 0;
  left: 0px;
  width: 100%;
  z-index: 200;
}

.page_nav {
  text-align: center;
  padding: 16px 0;
  background: rgba(255, 255, 255, 0.85);
  width: 100%;
}
.page_nav a {
  margin: 0 20px;
  text-decoration: none;
  font-size: 18px;
}

.page_top {
  text-align: right;
  margin: 40px 0;
}
.page_top a {
  margin: 0 20px;
  text-decoration: none;
  font-size: 18px;
}