header {
  display: none;
}
.main_img {
  display: none;
}
.topbar {
  display: none;
}
.nav {
  display: none;
}
.back_link {
  display: none;
}
.goal_of_study_h2 {
  display: none;
}
.goal_of_study p a {
  display: none;
}
.content_left {
  display: none;
}
.footer_up_back {
  display: none;
}
footer {
  display: none;
}

.content_right {
  float: none;
  width: 540px;
  height: auto;
  margin: auto;
}