aside {
  white-space: nowrap;
}

aside ul.ul_side {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Only stick if you can fit */
@media (min-height: 300px) {
  nav ul.ul_side {
    position: sticky;
    top: 0;
  }
}

aside ul li a {
  display: block;
  padding: 0.5rem 1rem;
  color: white;
  text-decoration: none;
}

aside ul li a.current {
  background: blue;
}


/* ____ Sidebar __________________________________*/

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 2;
  top: 0;
  left: 0;
  background-color: #111;
  opacity: 0.5;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  /*color: #818181;*/
  display: block;
  transition: 0.3s;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}



@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}