<div class="selector">
  <h2>[Attr|=value]</h2>
  <ul>
    <li data-years="1800-1900">The 19th Century</li>
    <li data-years="1900-2000">The 20th Century</li>
    <li data-years="2000-2100">The 21st Century</li>
  </ul>
</div

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@200;300;400;500;600;700&family=Raleway:wght@200;300;400;500;600;700&display=swap");
* {
  background: #000;
  color: #fff;
  font-size: 1.5rem;
  font-family: "Raleway", sans-serif;
}
h3,
h2 {
  font-size: 3rem;
  background-image: linear-gradient(25deg, #002657, #662b54, #a9264f, #ec004a);
  padding: 1em;
  font-weight: 300;
}
h2 {
  font-size: 2rem;
}

.selector {
  text-align: center;
  padding: 100px 0 0 0;
}
li {
  list-style: none;
}
/* 7 types of selectors */
/* attr|=value */
li[data-years|="1900"] {
  /* data-years attribute starts with 1900 as the only value or first in a dash-separated list */
  color: red;
}