body {
  font-family: "Helvetica", sans-serif;
}
.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  right: 0;
  background: rgba(66,66,66,0.7);
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}
.sidebar a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 5vw;  /* 25px */
  color: #fff;
  display: block;
  transition: 0.3s;
}

.sidebar a:hover {
  background-color: #333;
  color: #fff;
}

.sidebar .closebtn {
  position: relative;
  top: 0;
  right: 25px;
  font-size: 6vw;  /* 36px */
  margin-left: 50px;
}

.openbtn {
  float: right;
  font-size: 7vw;  /* 40px */
  cursor: pointer;
  background-color: #111;
  color: white;
  background-color: #666;
  padding: 0px 10px;
  border: none;
}

.openbtn:hover {
  background-color: #444;
}

#main {
  transition: margin-left .5s;
  padding: 16px;
}

/* On smaller screens, where height is less than 450px, change 
the style of the sidenav (less padding and a smaller font size) */

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