<header>
  <h2 class="title">element.style.columnRuleStyle</h2>
  <p class="description">Встановлює стиль лінії, що розділяє колонки у багатоколонковому макеті.</p>
</header>
<main>
  <div class="result">
    <div id="content">
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus imperdiet, nulla et dictum interdum, nisi lorem egestas odio, vitae scelerisque enim ligula venenatis dolor. Maecenas nisl est, ultrices nec congue eget, auctor vitae massa. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus imperdiet, nulla et dictum interdum, nisi lorem egestas odio, vitae scelerisque enim ligula venenatis dolor. Maecenas nisl est, ultrices nec congue eget, auctor vitae massa.
    </div>
    <div class="controls">
      <label for="styleSelector">Виберіть стиль розділювача колонок:</label>
      <select id="styleSelector">
        <option value="none">none</option>
        <option value="hidden">hidden</option>
        <option value="dotted">dotted</option>
        <option value="dashed">dashed</option>
        <option value="solid">solid</option>
        <option value="double">double</option>
        <option value="groove">groove</option>
        <option value="ridge">ridge</option>
        <option value="inset">inset</option>
        <option value="outset">outset</option>
      </select>
    </div>
  </div>
</main>
body {
  font-size: 16px;
  line-height: 1.5;
  font-family: monospace;
}

header {
  background-color: #f1f1f1;
  margin-bottom: 25px;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

header h2.title {
  padding-bottom: 15px;
  border-bottom: 1px solid #999;
}

header p.description {
  font-style: italic;
  color: #222;
}

.result {
  background-color: #f8f8f8;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

#content {
  column-count: 3;
  column-gap: 20px;
  column-rule: 2px solid #000;
  margin-bottom: 15px;
}

.controls {
  margin-top: 15px;
}

.controls label, .controls select {
  display: block;
  margin-bottom: 10px;
}
let element = document.getElementById('content');
let styleSelector = document.getElementById('styleSelector');

styleSelector.addEventListener('change', function() {
  element.style.columnRuleStyle = styleSelector.value;
});

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