How to center one button irrespective of another a tag which is displayed inline inside a div

I have following code

.container {
  height: auto;
  width: 200px;
  background-color: gray;
  display: inline-block;
  text-align: center;
}

.tocart {
  width: 150px;
  display: inline-block;
}

.wishlist {
  display: inline-block;
  right: 36px;
  opacity: 0;
  visibility: visible;
  position: relative;
}

.container:hover .wishlist {
  right: 0;
  visibility: visible;
  opacity: 1;
  transition: all 0.3s;
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">

<div class="container">
  <button class="tocart">
        Add to Cart
      </button>
  <a href="" class="wishlist"><i class="fa fa-heart"></i></a>
</div>

Currently the Add to cart button is shifted towards left due to wish-list icon. How to make my Add to cart button center of container div and shift it towards left when hovered on container class to accommodate wish-list icon?

Solution

You can achieve this using the position-property. Here is the edited CSS:

.container {
  height: auto;
  width: 200px;
  background-color: gray;
  display: inline-block;
  text-align: center;
  position: relative;
}

.tocart {
  width: 150px;
  display: inline-block;
}

.wishlist {
  display: inline-block;
  right: 36px;
  opacity: 0;
  visibility: visible;
  position: absolute;
}

.container:hover .wishlist {
  right: 15px;
  visibility: visible;
  opacity: 1;
  transition: all 0.3s;
  top: 2px;
}

.container:hover .tocart {
  float: left;
}

<head>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<div class="container">
  <button class="tocart">
    Add to Cart
  </button>
  <a href="" class="wishlist"><i class="fa fa-heart"></i></a>
</div>