<section class="section intro">
  <div class="container">
    <h1>Horizontal Timeline v2 &rarr;</h1>
    <p>Timeline v1 <a href="https://codepen.io/sami20a/full/gbOdMww" target="_blank">here</a></p>
  </div>
</section>

<section class="timeline">
  <div class="info">
    <img width="50" height="50" src="https://assets.codepen.io/210284/face.svg" alt="" />
    <h2>Company History</h2>
    <p>At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium</p>
    <p>
        <a href="">Learn more &gt;</a>
    </p>
  </div>

  <ol>
    <li>
      <div>
        <time>1934</time> At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium At vero eos et accusamus et iusto odio dignissimos.
      </div>
    </li>
    <li>
      <div>
        <time>1937</time> Proin quam velit, efficitur vel neque vitae, rhoncus commodo mi. Suspendisse finibus mauris et bibendum molestie. Aenean ex augue, varius et pulvinar in, pretium non nisi.
      </div>
    </li>
    <li>
      <div>
        <time>1940</time> Proin iaculis, nibh eget efficitur varius, libero tellus porta dolor, at pulvinar tortor ex eget ligula. Integer eu dapibus arcu, sit amet sollicitudin eros.
      </div>
    </li>
    <li>
      <div>
        <time>1943</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <time>1946</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <time>1956</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <time>1957</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <time>1967</time> Aenean condimentum odio a bibendum rhoncus. Ut mauris felis, volutpat eget porta faucibus, euismod quis ante.
      </div>
    </li>
    <li>
      <div>
        <time>1977</time> Vestibulum porttitor lorem sed pharetra dignissim. Nulla maximus, dui a tristique iaculis, quam dolor convallis enim, non dignissim ligula ipsum a turpis.
      </div>
    </li>
    <li>
      <div>
        <time>1985</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <time>2000</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <time>2005</time> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li></li>
  </ol>

</section>

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;700&display=swap");

:root {
  --white: #fff;
  --black: #323135;
  --crystal: #a8dadd;
  --columbia-blue: #cee9e4;
  --midnight-green: #01565b;
  --yellow: #e5f33d;
  --timeline-gradient: rgba(206, 233, 228, 1) 0%, rgba(206, 233, 228, 1) 50%,
    rgba(206, 233, 228, 0) 100%;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

button {
  background: transparent;
  border: none;
  cursor: pointer;
  outline: none;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
}

body {
  font: normal 16px/1.5 "Inter", sans-serif;
  background: var(--columbia-blue);
  color: var(--black);
  margin-bottom: 50px;
}

/* .section SECTION
–––––––––––––––––––––––––––––––––––––––––––––––––– */

.section {
  padding: 50px 0;
}

.section .container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.section h1 {
  font-size: 2.5rem;
  line-height: 1.25;
}

.section h2 {
  font-size: 1.3rem;
}

/* TIMELINE
–––––––––––––––––––––––––––––––––––––––––––––––––– */

.timeline {
  position: relative;
  white-space: nowrap;
  max-width: 1400px;
  padding: 0 10px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 320px auto;
  grid-gap: 20px;
}

.timeline::before,
.timeline::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 30px;
  width: 100px;
  z-index: 2;
}

.timeline::after {
  right: 0;
  background: linear-gradient(270deg, var(--timeline-gradient));
}

.timeline::before {
  left: 340px;
  background: linear-gradient(90deg, var(--timeline-gradient));
}

.timeline .info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 20px 40px;
  color: var(--white);
  background: var(--midnight-green);
  white-space: normal;
  border-radius: 10px;
}

.timeline .info img {
  margin-bottom: 20px;
}

.timeline .info p {
  margin-top: 10px;
  color: var(--crystal);
}

.timeline .info a {
  text-decoration: none;
}

.timeline ol::-webkit-scrollbar {
  height: 12px;
}

.timeline ol::-webkit-scrollbar-thumb,
.timeline ol::-webkit-scrollbar-track {
  border-radius: 92px;
}

.timeline ol::-webkit-scrollbar-thumb {
  background: var(--midnight-green);
}

.timeline ol::-webkit-scrollbar-track {
  background: var(--yellow);
}

.timeline ol {
  font-size: 0;
  padding: 250px 0;
  transition: all 1s;
  overflow-x: scroll;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--yellow) var(--midnight-green);
}

.timeline ol li {
  position: relative;
  display: inline-block;
  list-style-type: none;
  width: 160px;
  height: 5px;
  background: var(--white);
  scroll-snap-align: start;
}

.timeline ol li:last-child {
  width: 340px;
}

.timeline ol li:not(:first-child) {
  margin-left: 14px;
}

.timeline ol li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  left: calc(100% + 1px);
  bottom: 0;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  border-radius: 50%;
  background: var(--midnight-green);
  z-index: 1;
}

.timeline ol li div {
  position: absolute;
  left: calc(100% + 7px);
  width: 280px;
  padding: 15px;
  font-size: 1rem;
  white-space: normal;
  color: var(--black);
  background: var(--white);
  border-radius: 0 10px 10px 10px;
}

.timeline ol li div::before {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  width: 0;
  height: 0;
  border-style: solid;
}

.timeline ol li:nth-child(odd) div {
  top: -16px;
  transform: translateY(-100%);
  border-radius: 10px 10px 10px 0;
}

.timeline ol li:nth-child(odd) div::before {
  top: 100%;
  border-width: 8px 8px 0 0;
  border-color: var(--white) transparent transparent transparent;
}

.timeline ol li:nth-child(even) div {
  top: calc(100% + 16px);
}

.timeline ol li:nth-child(even) div::before {
  top: -8px;
  border-width: 8px 0 0 8px;
  border-color: transparent transparent transparent var(--white);
}

.timeline time {
  display: block;
  font-size: 1.4rem;
  font-weight: bold;
  margin-bottom: 8px;
  color: var(--midnight-green);
}

/* GENERAL MEDIA QUERIES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
@media screen and (max-width: 800px) {
  .timeline {
    display: block;
  }

  .timeline::before,
  .timeline::after {
    width: 50px;
  }

  .timeline::before {
    left: 0;
  }

  .timeline .info {
    display: none;
  }
}

/* FOOTER STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.page-footer {
  position: fixed;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  padding: 5px;
  z-index: 2;
  color: var(--black);
  background: var(--columbia-blue);
}

.page-footer a {
  display: flex;
  margin-left: 4px;
}

// VARIABLES
const elH = document.querySelectorAll(".timeline li > div");

// START
window.addEventListener("load", init);

function init() {
  setEqualHeights(elH);
}

// SET EQUAL HEIGHTS
function setEqualHeights(el) {
  let counter = 0;
  for (let i = 0; i < el.length; i++) {
    const singleHeight = el[i].offsetHeight;

    if (counter < singleHeight) {
      counter = singleHeight;
    }
  }

  for (let i = 0; i < el.length; i++) {
    el[i].style.height = `${counter}px`;
  }
}