'Display other div on button hover with transition

I'm really struggling to make my head around transitions. I've got a round button and I would like the div to show when the button is hovered. But I would like to have and "(un)fold" effect. Could you help me to add the animation to this css?

var btn = document.getElementById("open_feedback_form");
var x = document.getElementById("title");

btn.addEventListener("click", function()  {
  if (x.style.visibility === 'hidden') {
    x.style.visibility = 'visible';
  } else {
    x.style.visibility = 'hidden';
  }
});
.help_button {
    position: fixed;
    bottom: 10rem;
    right: 10rem;
    width: 5rem;
    height: 5rem;
    border-radius: 50%;
    border: none;
    box-shadow: 0 0 0 10px rgba(243, 147, 37, 0.4);
    background-color: #F39325;
    font-style: normal;
    font-weight: 600;
    font-size: 1.6rem;
    line-height: 150%;
    color: #ffffff;
}
.feedback-title {
    position: fixed;
    bottom: 10rem;
    right: 12.5rem;
    height: 5rem;
    background-color: #F39325;
    color: #ffffff;
    font-size: 1.6rem;
    line-height: 5rem;
    padding-right:2.5rem;
    padding-left:1rem;
    visibility: hidden;
}
<div class="feedback-title" id="title">Feedback form</div>
<button class="help_button" aria-label="help and feedback form" id="open_feedback_form">
    ?
</button>

I'm not even sure whether my approach here is correct.

javascripthtmlcss


Solution 1:[1]

Best practice for an unfold effect should be using the transform 3d properties. Wrap the feedback form in a container and transform the inner element from 100% from the x-as to 0%.

Solution 2:[2]

* {
  margin: 0;
  padding: 0;
}

.button-wrapper {
  position: relative;
  display: inline-block;
  margin: 50px;
  cursor: pointer;
}

.button-helper {
  white-space: nowrap;
  position: absolute;
  right: 0;
  top: 50%;
  z-index: -1;
  transform: translate3d(0, -50%, 0);
  transition: .5s ease;
}

.button {
  padding: 10px 30px;
}

.button-wrapper:hover .button-helper {
  transform: translate3d(calc(100% + 15px), -50%, 0);
}
<button class="button-wrapper" type="button">
  <p class="button-helper">Button info label</p>
  <div class="button">
    button text
  </div>
</button>

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 RoTra
Solution 2 Niels Reijnders

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