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HTML 

              
                <div class="c-card">
  <div class="c-card__header">
    <img class="c-card__media" src="http://via.placeholder.com/400x200" />
  </div>
  <div class="c-card__body">
    <h2 class="c-card__title">Card Title</h2>
    <p class="c-card__description">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
  </div>
  <div class="c-card__footer">
    <a href="#" class="c-btn c-card__cta">Call to action</a>
  </div>
</div>











<select class="theme-switcher">
    <option value="default">Select A Theme</option>
    <option value="theme-1">Theme 1</option>
    <option value="theme-2">Theme 2</option>
    <option value="theme-3">Theme 3</option>
    <option value="theme-4">Theme 4</option>
    <option value="theme-5">Theme 5</option>
</select>
!

CSS 

              
                







/*------------------------------------*\
    #CARD
\*------------------------------------*/

/**
 * Default variables 
 * 1) These can be seen as the "vanilla" button styles for the design   
 *    system. These define the necessary variables for each component,
 *    and applies a basic, "boring" aesthetic to it. 
 */
:root {
	--card-background-color: #fff;
	--card-text-color: #000;
  --card-font-family: Helvetica, sans-serif;
	--card-font-size: 1rem;
	--card-font-weight: 400;
	--card-border-width: 1px;
	--card-border-style: solid;
	--card-border-color: #808080;
	--card-border-radius: 0;
	--card-padding: 1rem;
  --card-box-shadow: none;
	--card-text-transform: normal;
	--card-letter-spacing: initial;
	--card-icon-width: 1rem;
	--card-icon-height: 1rem;
	--card-icon-color: currentColor;
  --card-transition: all 0.1 ease-out;
  
  --card-media-border-radius: 0;
  
  --card-header-margin-bottom: 1rem;
  
  --card-body-text-align: left;
  
  --card-title-font-size: 1.6rem;
  
  --card-description-font-family: inherit;
  
  --card-footer-justify-content: center;
}

/**
 * Theme 1 button styles
 * 1) Here we map the theme's second-tier global variables to the
 *    specific components.
 */
.theme-1 {
	--card-border-color: #eee;
  --card-border-radius: 16px;
  --card-text-color: var(--theme-1-text);
	--card-font-family: var(--theme-1-font-family-primary);
  --card-padding: 0rem;
	--card-letter-spacing: 1px;
  --card-padding: 0;
  --card-box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  
  --card-body-padding: 0 1rem 1rem;
  --card-body-text-align: center;
  
  --card-title-text-color: var(--theme-1-color-primary);
  --card-title-margin: 0 0 0;
  
  --card-description-font-family: Helvetica;
}

/**
 * Theme 2
 */
.theme-2 {
	--card-text-color: #a2a2a2;
	--card-hover-text-color: #fff;
	--card-border-color: #e5e5e5;
  --card-font-family: 'Merriweather', serif;
	--card-font-size: 13px;
	--card-text-transform: capitalize;
	--card-padding: 1rem;
  --card-box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  
  --card-header-margin-bottom: 0;
  
  --card-title-background-color: #317c2f;
  --card-title-text-color: #fff;
  --card-title-font-size: 18px;
  --card-title-padding: 0.3rem;
  --card-title-margin: 0 0 1rem;
}

/**
 * Theme 3
 */
.theme-3 {
	
	--card-font-family: 'Crete Round', serif;
	--card-font-size: 14px;
	--card-font-weight: 300;
	--card-letter-spacing: 2px;
  --card-border-width: 2;
  --card-border-color: #0892D0;
  --card-border-radius: 30px 0 30px 0;
  --card-box-shadow: 6px 6px 0 yellow;
	--card-padding: 1.5rem;
	--card-text-transform: normal;
  --card-description-font-family: Helvetica;
  --card-body-text-align: center;
}

/**
 * Theme 4
 */
.theme-4 {
	--card-border-color: #999;
	--card-font-family: 'Saira Condensed', sans-serif;
	--card-font-size: 11px;
	--card-font-weight: 500;
	--card-padding: 20px;
	--card-text-color: #333;
  --card-box-shadow: 8px 8px 0 #a60505;
	--card-text-transform: uppercase;
	--card-letter-spacing: 1.65px;
  --card-title-text-color: #a60505;
}

/**
 * Theme 5
 */
.theme-5 {
	--card-background-color: #fff;
	--card-font-family: 'Amatic SC', cursive;
	--card-text-color: blue;
	--card-hover-text-color: #252525;
	--card-text-transform: uppercase;
  --card-padding: 0;
  --card-border-width: 0;
	--card-letter-spacing: 0.8px;
	
  --card-body-padding: 1rem 1rem 4rem;
  --card-body-background: radial-gradient(ellipse at center, rgba(230,244,250,1) 0%, rgba(188,224,238,1) 100%);;
  
  --card-footer-justify-content: left;
  
  /* Additional, non-tokenied styles can be found below */
	
}

/**
 * Card
 * 1) These are the actual CSS properties for the card component.
 *    The shared CSS declarations as written as normal CSS, but 
 *    themeable values are expressed as variables. 
 * 2) Set a max-width for demo purposes, although probably would
 *    let the card be fluid in production.
 */
.c-card {
  font-family: var(--card-font-family);
	font-size: var(--card-font-size);
	font-weight: var(--card-font-weight);
	border-width: var(--card-border-width);
	border-style: var(--card-border-style);
	border-color: var(--card-border-color);
	border-radius: var(--card-border-radius);
	background-color: var(--card-background-color);
  box-shadow: var(--card-box-shadow);
	color: var(--card-text-color);
	padding: var(--card-padding);
	text-transform: var(--card-text-transform);
	letter-spacing: var(--card-letter-spacing);
	transition: var(--card-transition);
  max-width: 380px; /* 2 */
  position: relative;
  box-sizing: border-box;
}

/**
 * Card Header
 * 1) Contains the card media
 */
.c-card__header {
  margin-bottom: var(--card-header-margin-bottom);
}

/**
 * Card Media
 * 1) Typically an image, but could be a video or iframe
 */
.c-card__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--card-media-border-radius);
}

/**
 * Card Body
 * 1) Contains the card title and description
 */
.c-card__body {
  text-align: var(--card-body-text-align);
  margin: var(--card-body-margin);
  padding: var(--card-body-padding);
  background: var(--card-body-background);
}

/**
 * Card Title
 * 1) The heading for a card (can be an h2, h3, or h4)
 */
.c-card__title {
  margin: var(--card-title-margin);
  padding: var(--card-title-padding);
  font-size: var(--card-title-font-size);
  background: var(--card-title-background-color);
  color: var(--card-title-text-color);
}

/**
 * Card Description
 * 1) A <p> tag that contains the card's primary text
 */
.c-card__description {
  font-family: var(--card-description-font-family);
  margin-bottom: 1rem;
  margin-top: 0;
}


/**
 * Card Footer
 * 1) A <p> tag that contains the card's primary text
 */
.c-card__footer {
  display: flex;
  justify-content: var(--card-footer-justify-content);
}






/*------------------------------------*\
    #THEME CUSTOM STYLES
\*------------------------------------*/

/**
 * 1) It's possible to add custom, non-tokenied styles
 *    to a themed component. This could end up opening 
 *    Pandora's Box that could end up undermining the 
 *    system, but if managed properly can help bring a
 *    sense of polish to individual brands while not
 *    forcing the system to accomodate every brand's
 *    quirk.
 */
.theme-1  {
  .c-card {
    overflow: hidden;
  }
  
  .c-btn {
    flex: 1;
  }
}

.theme-5 {
  .c-card__media {
    box-shadow: 4px 4px 4px rgba(0,0,0,0.12);
  }
  
  .c-card__body {
    position: relative;
    top: -4rem;
    right: -2rem;
    box-shadow: 4px 4px 4px rgba(0,0,0,0.12);
  }
  
  .c-card__footer {
    position: relative;
    top: -7em;
    right: -3rem;
  }
}
!

JS 

              
                var themeSwitcher = document.querySelector('.theme-switcher');

themeSwitcher.addEventListener('change',function(){
    var themeName = this.value;
    console.log('name: '+themeName);
    document.body.className = "";
    document.body.classList.add(themeName);
});
!
999px

Console