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HTML 

              
                button.button-modal Open modal
.modal.is-open
  .modal-header
    span.modal-close
  .modal-body
    img(src="http://www.hiyabna.com/wp-content/uploads/2014/11/christmas-tree-handsome-christmas-tree-decorations-christmas-tree-john-roberts-christmas-tree-john-lewis-christmas-tree-jeremiah-christmas-tree-jewelry-christmas-tree-java-christmas-tree-jubile.jpg").modal-image
    .modal-info
      h3.modal-title Awesome Christmas Tree 2016
      p.modal-label Christmas Tree with decoration
      
      span.item-price $120
      
      p.item-description Make your festive decor sparkle with this classic Christmas tree pre-lit with 150 warm white LED lights. Standing around 6 feet tall, the tree is a great choice for those wanting a nice looking Christmas tree without the hassle of adding lights.
      
      .size
        h3 Size
        ul.sizes-list
          li.item-size.size-selected S
          li.item-size M
          li.item-size L
          li.item-size XL
          
      .color
        h3 Color of decoration
        ul.colors-list
          li.silver.color-selected
            .item-color
              input(type="radio")
          li.purple
            .item-color
              input(type="radio")
          li.red
            .item-color
              input(type="radio")
          li.orange
            .item-color
              input(type="radio")   
          li.green
            .item-color
              input(type="radio") 
              
  .modal-actions
    button.button-cart Add to cart
    button.button-wishlist Add to wishlist
!

CSS 

              
                $silver       : #ddd;
$red          : #EA3023;
$purple       : #9c27b0;
$orange       : #ff5722;
$black        : #333;
$green        : #91C519;
$midnight     : #242E3A;

@import url(https://fonts.googleapis.com/css?family=Roboto:400,500);

@mixin clearfix {
  &::after {
    clear: both;
    content: "";
    display: table;
  }
}

@mixin center {
  left: 50%;
  top: 50%;
  bottom: auto;
  right: auto;
  position: absolute;
  transform: translateX(-50%) translateY(-50%);
}
@keyframes fade-scale {
  0% {
    opacity: 0.8;
    transform: scale(0.8);
  }
  50% {
    opacity: 0.9;
    transform: scale(1.2);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes anim-effect-sonar {
  0% {
    transform: scale3d(0, 0, 1);
  }
  to {
    transform: scale3d(1, 1, 1);
  }
}

* {
  box-sizing: border-box;
}

ul {
  padding: 0;
  list-style: none;
}
html {
  height: 100%;
}
body {
  height: 100%;
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(45deg, rgba(244,66,54,1) 0%, rgba(245,140,84,1) 30%, rgba(244,66,54,1) 100%);
  color: $black;
}

img {
  max-width: 100%;
}

h3 { 
 font-weight: normal;
}

.modal {
  opacity: 0;
  visibility: hidden;
  position: relative;
  width: 800px;
  padding-bottom: 0;
  border-radius: 3px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  background-color: white;
  transition: visibility 0s ease-in-out 300ms, opacity 300ms ease-in-out;
  margin: 10% auto 0 auto;
  @include clearfix;
}

.modal-body {
  padding-top: 30px;
  padding-bottom: 40px;
  @include clearfix;
}

.modal-header {
  text-align: center;
}

.modal-title {
  font-weight: bold;
  margin-bottom: 0;
}

.modal-label {
  margin-top: 5px;
  margin-bottom: 15px;
  font-size: 12px;
  text-transform: uppercase;
  opacity: 0.5;
}

.modal-image {
  width: 50%;
  float: left;
}

.modal-info {
  float: left;
  width: 50%;
}

.modal-actions {
  width: 100%;
}

.colors-list li {
  display: inline-block; 
  margin-right: 50px;
  cursor: pointer;
}

.item-color {
  position: relative;
  &:before {
    content: '';
    position: absolute;
    background: $silver;
    height: 40px;
    width: 40px;
    border-radius: 50%;
    z-index: 99;
  }
  &:after {
    content: '';
    border: 2px solid #333;    
    height: 50px;
    width: 50px;
    top: -7px;
    left: -7px;
    position: absolute;
    border-radius: 50%;
    visibility: hidden;
    opacity: 0;
    z-index: 1;
  }
  &:last-child {
    margin-right: 0;
  }
}

.color-selected {
  .item-color:after {
    visibility: visible!important;
    opacity: 1!important;
    animation: anim-effect-sonar 250ms ease-out forwards;
  }
}

.size-selected {
  background: $silver;
  transition: background 250ms ease-in-out;
}

.purple { 
  .item-color:before {
    background: $purple; 
  }
}

.red { 
  .item-color:before {
    background: $red; 
  }
}

.orange { 
  .item-color:before {
    background: $orange; 
  }
}

.green { 
  .item-color:before {
    background: $green; 
  }
}

.color {
  position: relative;
}

.color input[type=radio] {
  visibility: hidden;
}

.size {
  @include clearfix;
}

.item-size {
  float: left;
  display: block;
  border-right: 1px solid $silver;
  border-top: 1px solid $silver;
  border-bottom: 1px solid $silver;
  padding: 3px 20px;
  cursor: pointer;
  &:first-child {
    border-left: 1px solid $silver;
  }
}

.item-price {
  font-size: 18px;
  font-weight: bold;
}

.item-description {
  opacity: 0.5;
}

.modal-close {
  height: 20px;
  width: 20px;
  position: absolute;
  top: 20px;
  right: 20px;
  cursor: pointer;
  &:after {
    content: '';
    position: absolute;
    top: 10px;
    right: 2px;
    width: 15px;
    height: 2px;
    background-color: $black;
    transform: rotate(45deg);
  }
  &:before {
    content: '';
    position: absolute;
    top: 10px;
    right: 2px;
    width: 15px;
    height: 2px;
    background-color: $black;
    transform: rotate(-45deg);
  }
  &:hover {
    opacity: 0.5;
  }
}

%button {
  background-color: $silver;
  border: none;
  padding: 10px 15px;
  color: white;
}

.button-modal {
  background-color: white;
  float: left;
  color: $black;
  border-radius: 3px;
  @include center;
  @extend %button;
}

.button-cart {
  background-color: $midnight;
  float: left;
  width: 50%;
  height: 50px;
  border-bottom-left-radius: 3px;
  @extend %button;
}

.button-wishlist {
  float: left;
  color: $black;
  width: 50%;
  height: 50px;
  border-bottom-right-radius: 3px;
  @extend %button;
}

.is-open {
  opacity: 1;
  visibility: visible;
  transition-delay: 0s;
  animation: fade-scale 250ms ease-out;
}
!

JS 

              
                $(document).ready(function() {
  
  //Open
  $('.button-modal').click(function() {
    $('.modal').addClass('is-open');
  });
  
  //Close
  $('.modal-close').click(function() {
    $('.modal').removeClass('is-open');
  });
  
  // Color
  $(".colors-list li").click(function(){
    $(this).addClass("color-selected").siblings(".colors-list li").removeClass("color-selected");
  });
  
  // Size
  $(".sizes-list li").click(function(){
    $(this).addClass("size-selected").siblings(".sizes-list li").removeClass("size-selected");
  });
});
!
999px

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