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              <body>
  <div class="container">
    <h1>
      With Param
    </h1>
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse vitae laoreet urna. Aliquam faucibus eros eu purus viverra rhoncus. In ut enim eu dolor lobortis tristique sit amet et odio. Duis mattis augue quis magna porta laoreet. Sed at libero eget est posuere porta. Phasellus vel lacus mollis, fringilla erat sit amet, ornare lectus. Ut eu dolor mi. Aliquam placerat erat eget eros porttitor elementum. Mauris in lacus efficitur, sollicitudin diam ut, dignissim purus. Nullam mattis gravida orci, non luctus libero tincidunt ac. Vivamus ac elementum augue. Cras lorem elit, ultrices non orci id, posuere mollis nunc. In hac habitasse platea dictumst. Sed malesuada velit dapibus elit pretium pretium.
    </p>
    <h1 class="check">
      No param
    </h1>
    <p class="check">
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse vitae laoreet urna. Aliquam faucibus eros eu purus viverra rhoncus. In ut enim eu dolor lobortis tristique sit amet et odio. Duis mattis augue quis magna porta laoreet. Sed at libero eget est posuere porta. Phasellus vel lacus mollis, fringilla erat sit amet, ornare lectus. Ut eu dolor mi. Aliquam placerat erat eget eros porttitor elementum. Mauris in lacus efficitur, sollicitudin diam ut, dignissim purus. Nullam mattis gravida orci, non luctus libero tincidunt ac. Vivamus ac elementum augue. Cras lorem elit, ultrices non orci id, posuere mollis nunc. In hac habitasse platea dictumst. Sed malesuada velit dapibus elit pretium pretium.
    </p>
  </div>
  <div id="dark-button">
    Dark mode
  </div>
  <script src="https://library.prototypo.io/ptypo.js"></script>
</body>
            
          
!
            
              * {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #333;
}

body {
  display:flex;
  justify-content: center
}

.container {
  width: 70%;
}

h1 {
  font-size: 100px;
  margin:0.2em 0;
  font-family: 'titleFont';
  font-weight: normal;
  transition: color .3s ease, background-color .3s ease;
}

h1.check {
  font-family: 'titleFont2';
}

p {
  font-size: 18px;
  line-height: 24px;
  font-family: 'paragraphFont';
  transition: color .3s ease, background-color .3s ease;
}

p.check {
  font-family: 'paragraphFont2';
}

#dark-button {
  position:fixed;
  bottom: 30px;
  left: 30px;
  background-color: #24d390;
  font-family: sans-serif;
  color: #fefefe;
  padding: 20px;
  border-radius: 5px;
  font-size: 14px;
  cursor: pointer;
}

#dark-button:hover {
  background-color: #19c085;
}

body.dark {
  background-color: #3b3b3b;
  
  h1, p {
    color: #fefefe;
    font-weight: normal;
  }
}
            
          
!
            
              //Try the library here https://app.prototypo.io
const ptypoFactory = new Ptypo.default();
const fontToggles = [];

ptypoFactory.createFont(
  'titleFont',
  Ptypo.templateNames.ELZEVIR).then(function(font) {
    //Setting up the right parameters
    font.changeParam('thickness', 110);
    
    //Storing the function that will be used to change from light to dark
    //and vice versa
    fontToggles.push({
      lightMode: function() {
        font.changeParam('thickness', 110);
      },
      darkMode: function() {
        font.changeParam('thickness', 107);
      },
    });
});

ptypoFactory.createFont(
  'paragraphFont',
  Ptypo.templateNames.GROTESK).then(function(font) {
    font.changeParams({thickness: 70, spacing: 0.5});
  
    fontToggles.push({
      lightMode: function() {
        font.changeParam('thickness', 70);
      },
      darkMode: function() {
        font.changeParam('thickness', 50);
      },
    });
});

//We create two control fonts to see how they compare to the transformed font
ptypoFactory.createFont('paragraphFont2', Ptypo.templateNames.GROTESK).then(function(font) {
  font.changeParams({thickness: 70, spacing: 0.5});
});
ptypoFactory.createFont('titleFont2', Ptypo.templateNames.ELZEVIR).then(function(font) {
  font.changeParams({thickness: 110, width: 1.15});
});

let button = document.getElementById('dark-button');

button.addEventListener('click', function(e) {
  document.body.classList.toggle('dark');
  
  fontToggles.forEach(function(toggle) {
    toggle[document.body.classList.contains('dark')
           ? 'darkMode'
           : 'lightMode']();
  });
})


            
          
!
999px
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