<header>
  <h2 class="title">element.style.borderLeftStyle</h2>
  <p class="description">Задає або змінює стиль лівої рамки елемента.</p>
</header>
<main>
  <div class="result">
    <div id="shape" class="shape"></div>
    <form id="borderStyleForm">
      <label for="borderStyleSelect">Змінити значення:</label>
      <select id="borderStyleSelect" name="borderStyleSelect">
        <option value="none">None</option>
        <option value="solid">Solid</option>
        <option value="dotted">Dotted</option>
        <option value="dashed">Dashed</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>
    </form>
  </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);
}

.shape {
  width: 200px;
  height: 200px;
  background-color: #4CAF50;
  border-left: 5px solid #000;
  margin-bottom: 15px;
}

form {
  display: flex;
  flex-direction: column;
}

label {
  margin: 5px 0;
}

select {
  padding: 5px;
}

let element = document.getElementById('shape');
let select = document.getElementById('borderStyleSelect');

select.addEventListener('change', () => {
    let selectedStyle = select.value;
    element.style.borderLeftStyle = selectedStyle;
});

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