body {
  margin-top: 25px !important;
}

.main-menu {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
}

.main-menu_link {
  display:block;
  color:black;
  padding:10px 6px;
  margin-left: 25px;
  font-family:'Courier New',serif;
  font-size:12px;
}