.sidenav {
  min-height:600px;
  width: 250px;
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  background-color:grey;
  overflow: hidden;
  transition: 0.5s;
  padding-top: 15px;
  height:auto;
  float:left;
}

.sidenav a {
  padding: 5px 15px;
  text-decoration: none;
  font-size: 15px;
  color: #fff;
  display: block;
  transition: 0.3s;
}

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

#main {
  transition: margin-left .5s;
  margin-left:250px;
}

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


@media only screen and (max-width: 750px) {
  .sidenav {padding-top: 15px;width:0px;}
  .sidenav a {font-size: 18px;}
  #main {
    margin-left:0;
  }
}