How to hide the navigation bar when the overlay appears

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Using code from W3schools 'Sidenav Overlay' I'm trying to create the same effect in Bootstrap. I have the .navbar-toggle floating left and the navbar-toggle still shows when the overlay moves right. Not sure how to hide the navbar-toggle when the overlay appears. First post, Thanks

CSS

 .navbar {
    webkit-box-shadow: 0px 2px 3px rgba(100, 100, 100, 0.49);
    moz-box-shadow:    0px 2px 3px rgba(100, 100, 100, 0.49);
    box-shadow:         0px 2px 3px rgba(100, 100, 100, 0.49);
    background-color: white;
    padding: 5px;
}

.navbar-brand {
    position: absolute;
    width: 100%;
    left: 0;
    top: 5px;
    text-align: center;
    margin: auto;
}
.navbar-toggle {
    z-index:3;
    border: none;
    cursor: pointer;
    float: left;
}

.navbar-toggle a:hover {
    border: none;
    background-color: none;
    cursor: pointer;
}

/* The side navigation menu */
.sidenav {
    height: 100%; /* 100% Full-height */
    width: 0; /* 0 width - change this with JavaScript */
    position: fixed; /* Stay in place */
    z-index: 1; /* Stay on top */
    top: 0;
    left: 0;
    background-color: #111; /* Black*/
    overflow-x: hidden; /* Disable horizontal scroll */
    padding-top: 60px; /* Place content 60px from the top */
    transition: 0.5s; /* 0.5 second transition effect to slide in the sidenav */
}

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

/* When you mouse over the navigation links, change their color */
.sidenav a:hover, .offcanvas a:focus{
    color: #f1f1f1;
}

/* Position and style the close button (top right corner) */
.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
}

/* Style page content - use this if you want to push the page content to the right when you open the side navigation */
#main {
    transition: margin-left .5s;
    padding: 20px;
}

/* 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) {
    .sidenav {padding-top: 15px;}
    .sidenav a {font-size: 18px;}
}

HTML

<header>
    <div class="navbar navbar-default navbar-fixed-top" role="navigation" id="slide-nav">
  <div class="container">
   <div class="navbar-header">
    <a class="navbar-toggle" onclick="openNav()">
      <span class="sr-only" >Toggle navigation</span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
     </a>
    <a class="navbar-brand" href="#">Test Nav</a>
    <div id="mySidenav" class="sidenav">
      <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
      <a href="#">About</a>
      <a href="#">Services</a>
      <a href="#">Clients</a>
      <a href="#">Contact</a>
    </div>
   </div>
   </div>
   </div>
  </header>

Javascript

/* Set the width of the side navigation to 250px */
function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
}

/* Set the width of the side navigation to 0 */
function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
}


Add z-index as 99 instead of 1 to .sidenav class

.sidenav {
background-color: #111;
height: 100%;
left: 0;
overflow-x: hidden;
padding-top: 60px;
position: fixed;
top: 0;
transition: all 0.5s ease 0s;
width: 0;
z-index: 99;
}