How can I make hover box on the right side of my div?

Question

I'm trying to modify this code, so the box would slide to the left side of the box. I was thinking that I should just change in class .overlay right: 0; to right: 100%;, but its not doing anything. It should look like this Also What should I do when when the box slides to the right side and I hover my mouse to it my box stays until I move my mouse away, how can I fix it?

Here is the css code when I did tha animation to the right side:

.container {
  position: relative;
  width: 50%;
}

.image {
  display: block;
  width: 100%;
  height: auto;
}

.overlay {
  position: absolute;
  bottom: 0;
  left: 100%;
  right: 0;
  background-color: #008CBA;
  overflow: hidden;
  width: 0;
  height: 100%;
  transition: .5s ease;
}

.container:hover .overlay {
  width: 100%;
}

.text {
  white-space: nowrap; 
  color: white;
  font-size: 20px;
  position: absolute;
  overflow: hidden;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
}

Answer 1

Use this code to move the overlay to left on hover

.overlay {
  position: absolute;
  bottom: 0;
  left: 0; 
  background-color: #008CBA;
  overflow: hidden;
  width: 0;
  height: 100%;
  transition: .5s ease;
}

.container:hover .overlay {
 width: 100%;
 left: -100%;
}

.container {
  position: relative;
  width: 50%;
  float:right;
}

.image {
  display: block;
  width: 100%;
  height: auto;
}

.overlay {
  position: absolute;
  bottom: 0;
  left: 0; 
  background-color: #008CBA;
  overflow: hidden;
  width: 0;
  height: 100%;
  transition: .5s ease;
}

.container:hover .overlay {
  width: 100%;
  left: -100%;
}

.text {
  white-space: nowrap; 
  color: white;
  font-size: 20px;
  position: absolute;
  overflow: hidden;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
}

<h2>Slide in Overlay from the Right</h2>
<p>Hover over the image to see the effect.</p>

<div class="container">
  <img src="https://www.w3schools.com/howto/img_avatar.png" alt="Avatar" class="image">
  <div class="overlay">
    <div class="text">Hello World</div>
  </div>
</div>

Answer 2

Is this what you're trying to do? https://codepen.io/anon/pen/MmNXmN

HTML

<h2>Slide in Overlay from the Right</h2>
<p>Hover over the image to see the effect.</p>

<div class="container">
    <img src="https://www.w3schools.com/howto/img_avatar.png" alt="Avatar" class="image">
    <div class="overlay">
        <div class="text">Hello World</div>
    </div>
</div>

CSS

.container {
  position: relative;
  width: 50%;
  float: right;
}

.image {
  display: block;
  width: 100%;
  height: auto;
}

.overlay {
  position: absolute;
  bottom: 0;
  right: 100%;
  right: 0;
  background-color: #008CBA;
  overflow: hidden;
  width: 0;
  height: 100%;
  transition: .5s ease;
}

.container:hover .overlay {
  width: 100%;
  right: 100%;
}

.text {
  white-space: nowrap; 
  color: white;
  font-size: 20px;
  position: absolute;
  overflow: hidden;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
}