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HTML

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About the <head>

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- 
  in a wrapping container include a header and a paragraph element 
  in the paragraph, include for each branch in the text a span element with the sup and sub elements 
-->
<div class="container">
  <h1>Complete the Story<sub>below</sub></h1>
  <p>
    The world is changed.
    I 
    <span class="choice">
      <sup>
        sense
      </sup>
      <sub>
        feel
      </sub> 
    </span>
    it in the water.
    I 
    <span class="choice">
      <sup>
        sense
      </sup>
      <sub>
        feel
      </sub> 
    </span>
    it in the earth.
    I 
    <span class="choice">
      <sup>
        smell
      </sup>
      <sub>
        see
      </sub> 
    </span>
    it in the air.
  </p>

  <p>
    Much that once was...is lost.
    <span class="choice">
      <sup>
        As
      </sup>
      <sub>
        For
      </sub> 
    </span>       
    none now live who 
    <span class="choice">
      <sup>
        remember
      </sup> 
      <sub>
        think of
      </sub>
    </span>
    it.
  </p>

  <p>
    It began with the 
    <span>
      <sup>
        creation
      </sup>
      <sub>
        forging
      </sub> 
    </span>
    of the Great Rings.
    </p>
    <p>
    <span class="choice">
      <sup>
        Four
      </sup>
      <sub>
        Three
      </sub>
    </span>
    were given to the Elves:
    Immortal, 
    <span>
      <sup>
        all-knowing
      </sup>
      <sub>
        wisest
      </sub>
    </span> 
    and fairest
    of all beings.
    </p>
    <p>
    Seven to the Dwarf-
    <span class="choice">
      <sup>
        lords
      </sup>
      <sub>
        people
      </sub>
    </span>.
    Great miners and 
    <span class="choice">
      <sup>
        artisans
      </sup>
      <sub>
        craftsmen
      </sub>
    </span>
    of the mountain halls.
    </p>
    <p>
    And nine...
    <span class="choice">
      <sup>
        nine
      </sup>
      <sub>
        too many
      </sub>
    </span>
    rings were gifted
    to the race of Men...who, above all else, 
    <span class="choice">
      <sup>
        desire
      </sup>
      <sub>
        long for
      </sub>
    </span>
    power.
    </p>
    <p>
    For 
    <span class="choice">
      <sup>
        inside
      </sup>
      <sub>
        within
      </sub>
    </span>
    these rings was 
    <span class="choice">
      <sup>
        bound
      </sup>
      <sub>
        hidden
      </sub>
    </span>
    the strength and 
    <span class="choice">
      <sup>
        will
      </sup>
      <sub>
        skill
      </sub>
    </span>
    to govern each race.
  </p>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Lato|Pacifico");

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  min-height: 100vh;
  width: 100%;
  font-family: 'Lato', sans-serif;
  color: #252525;
  background: 
    linear-gradient(to bottom right, #F1F1EE 0%, #A7A694 10%, transparent 10%), 
    linear-gradient(to bottom left, #F1F1EE 0%, #A7A694 10%, transparent 10%), 
    linear-gradient(to top right, #F1F1EE 0%, #A7A694 10%, transparent 10%), 
    linear-gradient(to top left, #F1F1EE 0%, #A7A694 10%, transparent 10%), 
    #A7A694;
}

.container {
  max-width: 650px;
  margin: 2rem auto;  
}
.container h1 {
  text-align: center;
}
.container h1 sub {
  font-size: 1rem;
}
.container p {
  font-size: 1.4rem;
  /* increase the line-height to accommodate for the vertically positioned sup and sub elements */
  line-height: 2;
  margin: 1rem;
}
.container p:first-letter {
  /* style the first letter of every paragraph to be larger and cursive */
  font-family: 'Pacifico', cursive;
  font-size: 2rem;
}
.container span.choice {
  font-size: 1.4rem;
  margin: 0 0.3rem;
}
.container p sub, .container p sup {
  font-style: italic;
  cursor: pointer;
  border-radius: 6px;
  border: 2px solid #838C7B;
  transition: all 0.2s ease-out;
  /* position relative to separate a little more the elements from each other, vertically */
  position: relative;
}
.container p sup {
  bottom: 10px;
}
.container p sub {
  top: 10px;
}
.container p sub:hover, .container p sup:hover {
  /* on hover change the color of the backround to match the color of the border */
  background: #838C7B;
}
!

JS 

              
                // target all sup and sub elements in the paragraph element
const sup = document.querySelectorAll("p sup");
const sub = document.querySelectorAll("p sub");

// add an event listener on all sup and sub elements, at which point call a function which removes the choice not made and displays the correct text in a span
sup.forEach(sup => sup.addEventListener("click", displayChoice));
sub.forEach(sub => sub.addEventListener("click", displayChoice));

function displayChoice(e) {
    // target the parent element of the clicked sup/sub element
    let parentSpan = e.target.parentNode;
    
    // include in the HTML of the span element only the text of the clicked sup/sub element, effectively removing the sup/sub elements themselves
    parentSpan.innerHTML = `${e.target.textContent}`;
    // reset the margin altered in the script
    parentSpan.style.marginLeft = `0px`;
    parentSpan.style.marginRight = `0px`;  
}

// loop through all sup elements (which are horizontally pushed to the right of sub elements)
sub.forEach(sub => {
    // consider the width of the sub elements
    let subWidth = sub.offsetWidth;

    // push the sub elements to the left, by a measure equal to their width
    sub.parentNode.style.marginLeft = `-${subWidth}px`;
    // move the connected sup element to the right by an equal amount, making the sup and sub elements coincide to the right edge of the sub elements
    sub.parentNode.querySelector("sup").style.left = `${subWidth}px`;
});
!
999px

Console