select下拉菜单 css

<select>
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

<select multiple>
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

/* 基础样式 */
select {
  width: 200px;
  padding: 8px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

/* 选中项样式 */
select option:checked {
  background-color: #f0f0f0;
}

/* 鼠标悬停样式 */
select:hover {
  border-color: #666;
}

<div class="custom-select">
  <div class="selected-option">Select an option</div>
  <div class="options">
    <div class="option">Option 1</div>
    <div class="option">Option 2</div>
    <div class="option">Option 3</div>
  </div>
</div>

.custom-select {
  position: relative;
  width: 200px;
}

.selected-option {
  border: 1px solid #ccc;
  padding: 8px;
  cursor: pointer;
}

.options {
  display: none;
  position: absolute;
  width: 100%;
  border: 1px solid #ccc;
  border-top: none;
  background-color: #fff;
}

.option {
  padding: 8px;
  cursor: pointer;
}

.option:hover {
  background-color: #f0f0f0;
}

document.querySelector('.selected-option').addEventListener('click', function() {
  document.querySelector('.options').style.display = 'block';
});

document.querySelectorAll('.option').forEach(function(option) {
  option.addEventListener('click', function() {
    document.querySelector('.selected-option').textContent = option.textContent;
    document.querySelector('.options').style.display = 'none';
  });
});