<header>
  <h2 class="title">element.style.flexGrow</h2>
  <p class="description">Визначає, наскільки елемент повинен розширюватися, щоб заповнити доступний простір в контейнері flex.</p>
</header>
<main>
  <div class="result">
    <!-- Кнопки для зміни значення flex-grow для елементів -->
    <div>
      <button id="growFirst">Grow First Box</button>
      <button id="growSecond">Grow Second Box</button>
      <button id="resetGrow">Reset Growth</button>
    </div>
    <!-- Flex-контейнер з елементами для демонстрації -->
    <div class="flex-container">
      <div id="box1" class="flex-box">Box 1</div>
      <div id="box2" class="flex-box">Box 2</div>
      <div id="box3" class="flex-box">Box 3</div>
    </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);
}

.flex-container {
  display: flex;
  gap: 10px;
  width: 100%;
}

.flex-box {
  flex-grow: 1;
  padding: 20px;
  background-color: #4CAF50;
  color: white;
  text-align: center;
  transition: flex-grow 0.3s ease;
}

document.addEventListener('DOMContentLoaded', function() {
  const box1 = document.getElementById('box1');
  const box2 = document.getElementById('box2');
  const box3 = document.getElementById('box3');
  const growFirstButton = document.getElementById('growFirst');
  const growSecondButton = document.getElementById('growSecond');
  const resetGrowButton = document.getElementById('resetGrow');

  growFirstButton.addEventListener('click', function() {
    box1.style.flexGrow = '3';
    box2.style.flexGrow = '1';
    box3.style.flexGrow = '1';
  });

  growSecondButton.addEventListener('click', function() {
    box1.style.flexGrow = '1';
    box2.style.flexGrow = '3';
    box3.style.flexGrow = '1';
  });

  resetGrowButton.addEventListener('click', function() {
    box1.style.flexGrow = '1';
    box2.style.flexGrow = '1';
    box3.style.flexGrow = '1';
  });
});

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