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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="modal">
  <div class="overlay"></div>
  <div class="modal__contents modal--transition">
    <div class="modal-header">
      <h3> <span> Whoops!<span> <b>It looks like this offer has expired<br> or else been used by another customer.</b></h3>
    </div>
    <div class="modal-body">
      <div class="content-left">
         <p>
            Continue with sending this card <br>
            for $1.98 plus shipping.
         </p>
         <a href="#"class="btn-green-flat">Send Card</a>
       </div>
      <div class="content-right">
         <p> To learn how to send this card<br> for free contact <span class="sponsor-name">Jordan Adler</span> <br> through the link below.</p>
         <a href="#"class="btn-green-flat">Contact</a>
      </div>
    </div>
  </div>
</div>

<div class="dib tc">
  <h1>Responsive Modal</h1>
  <p>Uses different transitions based on screen size.</p>
  <a class="btn-green-flat-trigger" href="#">Show Modal</a>
</div>
!

CSS 

              
                * {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
}

body {
  font-family: "Helvetica Neue";
  color: #666;
  padding: 40px;
}

a {
  color: #D4341A;
  text-decoration: none;
}

.tc {
  text-align: center;
}

.dib {
  display: block;
}

.credit {
  position: fixed;
  bottom: 10px;
  width: 100%;
  left: 0;
}
.btn-green-flat-trigger{
  border: 1px solid #47ba6b;
  background: transparent;
  font-size: 20px;
  color: #47ba6b;
  font-weight: 200;
  padding: 15px 30px;
  display: inline-block;
  margin: 0 auto;
  margin-top: 40px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -o-border-radius: 4px;
  border-radius: 4px;
  cursor: pointer;
}

.btn-green-flat {
  border: 1px solid #47BA6B;
  background: rgba(0, 0, 0, 0);
  font-size: 20px;
  color: #47BA6B;
  font-weight: 200;
  padding: 10px 28px;
  text-align: center;
  width: 175px;
  display: block;
  margin: 0 auto;
  margin-top: 20px;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -o-border-radius: 4px;
  border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
}
.overlay {
	background: rgba(255, 255, 255, 0.77);
	position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.modal {
  visibility: hidden;
}

.modal__contents {
  background: #FFF;
  -webkit-box-shadow:0 0 8px 2px rgba(182, 182, 182, 0.75);
  -moz-box-shadow:0 0 8px 2px rgba(182,182,182, 0.75);
  -o-box-shadow:0 0 8px 2px rgba(182,182,182,0.75);
  box-shadow:0 0 8px 2px rgba(182,182,182,0.75);
  width: 50%;
  position: absolute;
  left: 38%;
  margin-left: -14%;
  top: 15%;
  min-height: 450px;
}
.modal-header{
  border-bottom: 1px solid #ccc;
}
.modal-header h3{
  color: #34495E;
  text-align: center;
  font-weight: bold;
  font-size: 22px;
}
.modal-header span{
  font-weight: 200;
}
.modal-body{
  width: 100%;
}
.modal-body p{
  color: #34495E;
  font-size: 16px;
  line-height: 23px;
	text-align: center;
}
.modal-body .content-left {
  height: 225px;
  width: 50%;
  position: relative;
  top: 55px;
  float: left;
  border-right: 1px solid #CCC;
}

.modal-body .content-right{
  height: 225px;
  width: 50%;
  position: relative;
  top: 55px;
  float: left;
}
.content-right .sponsor-name{
  font-weight: bold;
  color: #000;
}
.modal__contents h1 {
  margin: 0;
  padding: 0;
  line-height: 32rem;
  text-align: center;
  display: block;
}

.modal__close {
  position: absolute;
  right: 2rem;
  top: 2rem;
  text-decoration: none;
  display: none;
}

.modal--show {
  visibility: visible;
}

.modal--transition {
	-webkit-transform: scale(0.7);
	-moz-transform: scale(0.7);
	-ms-transform: scale(0.7);
	transform: scale(0.7);
	opacity: 0;
	-webkit-transition: all 0.3s;
	-moz-transition: all 0.3s;
	transition: all 0.3s;
}

.modal--show .modal--transition {
	-webkit-transform: scale(1);
	-moz-transform: scale(1);
	-ms-transform: scale(1);
	transform: scale(1);
	opacity: 1;
}

@media (max-width: 1139px){
	.modal p{
    text-align: center;
  }
  .modal-body .content-left{
  	width: 80%;
    display:block;
    float: none;
    margin: 0 auto;
    border-right: none;
    border-bottom: 1px solid #ccc;
}
  .modal-body .content-right{
    width: 80%;
    display: block;
    margin: 40px auto;
    float: none;
    border-right: none;
  }
}

@media (max-width : 991px) {
	
  .modal__contents {
  	top: 0;
  	left: 0;
    bottom: 0;
    width: 100%;
    margin: 0;
  }
  .modal-header h3{
    font-size: 18px;
  }
  .modal__close {
    display: block;
  }
  
  .modal--transition {
    -webkit-transform: translateX(-0) translateY(150%);
    -moz-transform: translateX(-0) translateY(150%);
    -ms-transform: translateX(-0) translateY(150%);
    transform: translateX(-0) translateY(150%);
  }
  
}
!

JS 

              
                var modal = $('.modal');

$( ".btn-green-flat-trigger" ).on( "click", function() {
  $( modal ).toggleClass('modal--show');
});

$( ".overlay" ).on( "click", function() {
  $( modal ).toggleClass('modal--show');
});

$( ".modal__close" ).on( "click", function() {
  $( modal ).toggleClass('modal--show');
});
!
999px

Console