<main id="main">
      <header>
        <h1 id="title">Marie Curie</h1>
        <p>The only person to win a Nobel Prize in two scientific fields.</p>
      </header>
      <figure id="img-div" class="image">
        <img src="https://upload.wikimedia.org/wikipedia/commons/c/c8/Marie_Curie_c._1920s.jpg" id="image" alt="A photograph depicting Marie Curie in the year 1920.">
        <figcaption id="img-caption">Marie Curie, 1920</figcaption>
      </figure>
      <section id="tribute-info">
        <p class="bold-paragraph">Here's a time line of Marie Curie's life:</p>
        <ul class="custom-list">
          <li>
            <span><strong>1867</strong> - Born in Warsaw, Poland.</span>
          </li>
          <li>
            <span><strong>1891</strong> - Earns advanced degrees and conducts subsequent scientific work in Paris.</span>
          </li>
          <li>
            <span><strong>1895</strong> - Marries the French physicist Pierre Curie.</span>
          </li>          
          <li>
            <span><strong>1903</strong> - Receives the Nobel Prize in Physics for developing the theory of "radioactivity".</span>
          </li>
          <li>
            <span><strong>1911</strong> - Receives the Nobel Prize in Chemistry for her discovery of the elements polonium and radium.</span>
          </li>
          <li>
            <span><strong>1920</strong> - Founds the Curie Institute a major medical research centre in Paris.</span>
          </li>
          <li>
            <span><strong>1922</strong> - Marie Curie becomes a fellow of the French Academy of Medicine.</span>
          </li>
          <li>
            <span><strong>1922</strong> - She becomes a member of the League of Nations' newly created International Committee on Intellectual Cooperation.</span>
          </li>
          <li>
            <span><strong>1923</strong> - Marie Curie writes a biography of her late husband, titled <em>Pierre Curie</em>.</span>
          </li>
          <li>
            <span><strong>1930</strong> - She is elected to the International Atomic Weights Committee, on which she serves until her death.</span>
          </li>
          <li>
            <span><strong>1932</strong> - Founds another Curie Institute a major medical research centre in Warsaw.</span>
          </li>
          <li>
            <span><strong>1934</strong> - Dies at the age of 66.</span>
          </li>
        </ul>
      </section>
      <p class="bold-paragraph">If you have time, you should read more about this incredible human being on her <a id="tribute-link" href="https://en.wikipedia.org/wiki/Marie_Curie" target="_blank">Wikipedia entry</a>.</p>    
    </main>

main {
  background-color: #f5f6f7;
  font-family: sans-serif;
  font-size: 18px;
  padding-bottom: 1px;
  margin-bottom: 30px;
}

h1 {
  text-align: center;
  font-size: 40px;
  margin-top: 25px;
  padding-top: 40px;
}

p {
  text-align: center;
  padding-bottom: 5px;
}

.bold-paragraph {
  font-weight: bold;
  font-size: 20px;
  margin: 30px auto;
  width: 80%;
}

.image {
  width: 96%;
  background-color: white;
  margin: auto;
  padding: 20px 0;
}

img {
  width: 70%;
  max-width: 100%;
  display: block;
  margin: 0 auto;
}

figcaption {
  text-align: center;
  margin-top: 15px;
}

section {
  width: 50%;
  margin: auto;
}
.custom-list {
  list-style-type: none;
  text-align: left;
}

.custom-list li {
  display: table;
  margin-bottom: 15px;
  line-height: 1.5;
}

.custom-list li::before {
  content: '\2022';
  font-weight: bold;
  margin-right: 10px;
}

.custom-list li span {
  display: table-cell;
}

a:visited {
  color: brown;
}

a:hover {
  color: black;
}

a:active {
  color: springgreen;
}