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HTML 

              
                <h1>Animated Speech Bubble (Bouncy)</h1>
<p>Hover the mouse over the rectangle and something cool will happen</p>
<div id="Rectangle">
  <div id="SpeechBubble">I'm a rectangle</div>
</div>
!

CSS 

              
                /* Fonts from Google Fonts - more at https://fonts.google.com */
@import url("https://fonts.googleapis.com/css?family=Open+Sans:400,700");
@import url("https://fonts.googleapis.com/css?family=Merriweather:400,700");

body {
  background-color: white;
  font-family: "Open Sans", sans-serif;
  padding: 5px 25px;
  font-size: 18px;
  margin: 0;
  color: #444;
}

h1 {
  font-family: "Merriweather", serif;
  font-size: 32px;
}

/* #Rectangle is given a relative position so that 
#SpeechBubble (its child) can be positioned correctly. 
Without this step, #SpeechBubble  will be positioned 
relative to the body instead */
#Rectangle {
  margin: 90px auto;
  background-color: #ff5a5a;
  width: 100px;
  height: 200px;
  position: relative;
}

/* #SpeechBubble is set as a child of #Rectangle to make positioning
it easier. #SpeechBubble is given an absolute position so that its 
position is relative to the #Rectangle (its parent). Its scale is 
set to zero since it should only appear when the mouse hovers over
#Rectangle. The 'animation-fill-mode' property is set to 'forwards' 
so that  the scale value stays at 1 after the animation finishes, 
otherwise  #SpeechBubble will disappear once the animation finishes. 
The 'animation-name' property is omitted since it's going to be 
set by jQuery instead */
#SpeechBubble {
  position: absolute;
  transform-origin: 0% 100%;
  text-align: center;
  background-color: #5a5a5a;
  color: white;
  border-radius: 10px;
  width: 120px;
  padding: 10px;
  left: 110px;
  top: -75px;
  transform: scale(0);
  animation-fill-mode: forwards;
}
/* We need to add a tail to the speech bubble. This is done using
the ::before pseudo-element. The tail's size is controlled by 
its borders. The right and bottom borders are given a transparent
color so that the tail still retains its shape while giving the
desired look */
#SpeechBubble::before {
  content: "";
  display: block;
  width: 0;
  position: absolute;
  bottom: -25px;
  left: 5px;
  border-style: solid;
  border-width: 15px;
  border-color: #5a5a5a transparent transparent #5a5a5a;
  transform: rotate(10deg);
}

/* Here the scale changes from 0 to 1. To add the bounciness 
effect, the scale is set to 1.25 midway through the animation
to give the animation a nicer effect. */
@keyframes expand-bounce {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.25);
  }
  100% {
    transform: scale(1);
  }
}

/* Here the scale simply goes from 1 back to 0 */
@keyframes shrink {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(0);
  }
}
!

JS 

              
                var rectangle = $("#Rectangle");
var speechBubble = $("#SpeechBubble");

// The the user hovers the mouse over
// the rectangle the "expand-bounce"
//animation is called and the duration
// is set to 250 miliseconds.
// When the user moves the mouse away
// the "shrink" animation gets called
// and the duration is set to 100
// miliseconds.
rectangle.hover(
  function() {
    speechBubble.css({
      "animation-name": "expand-bounce",
      "animation-duration": "0.25s"
    });
  },
  function() {
    speechBubble.css({
      "animation-name": "shrink",
      "animation-duration": "0.1s"
    });
  }
);
!
999px

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