How To Convert Slide From Left Curtain Menu , To Slide In From Right

The Problem We need a curtain to animate from right hand side of screen , inwards to the left. I found an almost PERFECT example of this ( except this only comes in from the left,

Solution 1:

All you need is instead of left: 0 in .overlay turn it into right: 0 to allow it to open from right hand side. Also, in the JavaScript part change the width to 25% not 100% and you're done !

Here's a demo (the old comments are removed to allow the new comments to be distinguishable) :

function openNav() {
  document.getElementById("myNav").style.width = "25%"; /** from 100% to 25% **/
}

function closeNav() {
  document.getElementById("myNav").style.width = "0";
}

.overlay {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  right: 0;
  /** it was left: 0, now it opens from right **/
  top: 0;
  background-color: rgb(0, 0, 0);
  background-color: rgba(0, 0, 0, 0.9);
  overflow-x: hidden;
  transition: 0.5s;
}

.overlay-content {
  position: relative;
  top: 25%;
  width: 100%;
  text-align: center;
  margin-top: 30px;
}

.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.overlay a:hover,
.overlay a:focus {
  color: #f1f1f1;
}

.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

@media screen and (max-height: 450px) {
  .overlay a {
    font-size: 20px
  }
  .overlay .closebtn {
    font-size: 40px;
    top: 15px;
    right: 35px;
  }
}

<div id="myNav" class="overlay">

  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>

  <div class="overlay-content">
    <a href="#">About</a>
    <a href="#">Services</a>
    <a href="#">Clients</a>
    <a href="#">Contact</a>
  </div>

</div>

<span onclick="openNav()">open</span>