<header>
  <h2 class="title">element.style.borderLeftWidth</h2>
  <p class="description">Задає або змінює ширину лівої рамки елемента.</p>
</header>
<main>
  <div class="result">
    <div id="shape" class="shape"></div>
    <form id="borderWidthForm">
      <label for="borderWidthRange">Adjust Left Border Width:</label>
      <input type="range" id="borderWidthRange" name="borderWidthRange" min="0" max="50" value="5">
    </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;
}

input[type="range"] {
  width: 100%;
}

document.getElementById('borderWidthRange').addEventListener('input', () => {
    let shape = document.getElementById('shape');
    let newValue = document.getElementById('borderWidthRange').value;
    shape.style.borderLeftWidth = `${newValue}px`;
});

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