<div class="frame">
  <div id="modal" class="modal">
    <img src="http://100dayscss.com/codepen/alert.png" width="44" height="38">
    <span class="title">Oh snap!</span>
    <p>An error has occured while creating an error report.</p>
    <div id="button" class="button">Dismiss</div>
  </div>
</div>

@import url(https://fonts.googleapis.com/css?family=Open+Sans:700,300);

.frame {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  height: 400px;
  margin-top: -200px;
  margin-left: -200px;
  border-radius: 2px;
  box-shadow: 4px 8px 16px 0 rgba(0,0,0,0.1);
  overflow: hidden;
  background: #fff;
  color: #333;
  font-family: 'Open Sans', Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  //-----------------
  background-color: #3F3F3F;
  
}

.modal {
  position: relative;
  width: 280px;
  height: 210px;
  text-align: center;
  background-color: white;
  border-radius: 3px;
  box-shadow: 4px 8px 12px 0 rgba(0, 0, 0, 0.4);
  animation: show-modal .7s ease-in-out;
  
  &.hide {
    animation: hide-modal .6s ease-in-out both;
  }
  
  img {
    margin-top: 24px;
  }
  .title {
    display: block;
    line-height: 24px;
    font-size: 18px;
    font-weigth: 400;
    margin: 14px 0 5px 0;
  }
  p {
    display: block;
    margin: 0;
    padding: 0 30px;
    font-size: 14px;
    line-height: 19px;
  }
  .button {
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    bottom: 0;
    width: 280px;
    height: 40px;
    cursor: pointer;
    font-size: 10;
    border-radius: 0 0 3px 3px;
    background-color: #F65656;
    transition: background-color 0.3s ease-in-out;
    transition: height 0.25s ease;
    &:hover {
      background-color: #EC3434;
    }
    &:active .modal{
      background-color: lightblue;
    }
  }
}

@keyframes show-modal {
  0% {
    transform: scale(0);
  }
  60% {
    transform: scale(1.1);
  }
  80% {
    transform: scale(.95);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes hide-modal {
  0% {
    transform: scale(1);
  }
  20% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(0);
  }
}

button.onclick = function() {
  document.querySelector('.modal').classList.add('hide');
};