html - 响应时间轴

Question

我需要一个响应时间线，每个数字下都有标签 ( JSFiddle Example ):

<ul>
  <li>1</li>
  <li>2</li>
  <li class="active">3</li>
  <li>4</li>
</ul>  

CSS 如下:

li {
  width: 2em;
  height: 2em;
  text-align: center;
  line-height: 2em;
  border-radius: 1em;
  background: dodgerblue;
  margin: 0 1em;
  display: inline-block;
  color: white;
  position: relative;
}

li::before{
  content: '';
  position: absolute;
  top: .9em;
  left: -4em;
  width: 4em;
  height: .2em;
  background: dodgerblue;
  z-index: -1;
}

li:first-child::before {
  display: none;
}

.active {
  background: dodgerblue;
}

.active ~ li {
  background: lightblue;
}

.active ~ li::before {
  background: lightblue;
}

我怎样才能:
1. 使其具有响应性，以便在浏览器调整大小时改变圆圈之间的距离？
2.如何在每个圆圈下添加标签？

Answer 1

看看我为你做的 jsfiddle 如果我理解有误请原谅如果你需要什么就问我。

https://jsfiddle.net/Lvxctyq1/

HTML

<section class="section intro">
  <div class="container">
    <h1>TIMELINE &rarr;</h1>
  </div>
</section>

<section class="timeline">
  <ol>
    <li>
      <div>
       <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
        <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li>
      <div>
         <info>1943</info> In mattis elit vitae odio posuere, nec maximus massa varius. Suspendisse varius volutpat mattis. Vestibulum id magna est.
      </div>
    </li>
    <li></li>
  </ol>
</section>

CSS

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

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

body {
  font: normal 16px/1.5 "Helvetica Neue", sans-serif;
  background: #456990;
  color: #fff;
}


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

.section {
  background: #F45B69;
  padding: 50px 0;
}

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

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

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


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

.timeline {
  white-space: nowrap;
  overflow-x: hidden;
}

.timeline ol {
  font-size: 0;
  width: 100vw;
  padding: 250px 0;
  transition: all 1s;
}

.timeline ol li {
  position: relative;
  display: inline-block;
  list-style-type: none;
  width: 160px;
  height: 3px;
  background: #fff;
}

.timeline ol li:last-child {
  width: 280px;
}

.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: 12px;
  height: 12px;
  transform: translateY(-50%);
  border-radius: 50%;
  background: #F45B69;
}

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

.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%);
}

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

.timeline info {
  display: block;
  font-size: 1.2rem;
  font-weight: bold;
  margin-bottom: 8px;
}


/* GENERAL MEDIA QUERIES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
@media screen and (max-width: 599px) {
  .timeline ol,
  .timeline ol li {
    width: auto; 
  }

  .timeline ol {
    padding: 0;
    transform: none !important;
  }

  .timeline ol li {
    display: block;
    height: auto;
    background: transparent;
  }

  .timeline ol li:first-child {
    margin-top: 25px;
  }

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

  .timeline ol li div {
    width: 94%;
    height: auto !important;
    margin: 0 auto 25px;
  }

  .timeline ol li div {
    position: static;
  }

  .timeline ol li:nth-child(odd) div {
    transform: none;
  }

  .timeline ol li:nth-child(odd) div::before,
  .timeline ol li:nth-child(even) div::before {
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    border: none;
    border-left: 1px solid white;
    height: 25px;
  }