Trucos y efectos de CSS3 2r3o47 Tutoriales En Linea

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<!doctype html>
<html lang="es">
<head>
<meta charset="utf-8">
<title>Trucos y efectos de CSS3 - Tutoriales En Linea</title>
</head>
<body>

<style>
  main {
    width: 100%;
    padding: 39px 29px;
    font-size: 12px;
  }
  section {
    width: 100%;
    box-shadow: 0 0 0 1px #eee;
    overflow: hidden;
  }
  section > span{
    width: 20%;
    display: inline-block;
    vertical-align: middle;
    margin-left: -3px;
    padding-left: 12px;
  }
  section::after {
    content: '';
    display: inline-block;
    height: 100%;
    vertical-align: middle;
  }
  .left {
    width: 45%;
    margin-left: 0;
    padding: 12px;
  }
  .center {
    width: 35%;
    border: 1px solid #eee;
    padding-top: 999px;       /* h */
    padding-bottom: 999px;    /* a */
    margin-top: -999px;       /* c */
    margin-bottom: -999px;    /* k */
    position: relative;
  }
  .left .item {
    width: 100%; height: 85px;
    text-align: center;
    line-height: 85px;
    background: rgba(180,160,120,.1);
    position: relative;
  }
  .left .item:not(:first-child) {
    margin-top: 24px;
  }
  .left .item:not(:first-child)::before {
    content: '';
    position: absolute;
    top: -12px; right: -12px; left: -12px;
    border-top: 1px solid #eee;
  }
</style>

<main class="main">
    <section>
      <span class="left">
        <div
          v-for="ele in elements"
          @click="handleClick"
          class="item">
          {{symbol}}
        </div>
      </span>
      <span class="center">Vertical centering<br>Vertical centering Vertical centering</span>
      <span class="right">Vertical centering</span>
    </section>
</main>

<script>
  export default {
    data () {
      return {
        elements: Array(2).fill(1),
        symbol: '➕'
      }
    },
    methods: {
      handleClick () {
        this.elements.length == 2 ? (_ => {
          this.elements.push(1);
          this.symbol = '➖';
        })() : (_ => {
          this.elements.pop();
          this.symbol = '➕';
        })()
      }
    }
  }
</script>

</body>
</html>