<div class="btn-group">
  <button class="button">Nút 1</button>
  <button class="button">Nút 2</button>
  <button class="button">Nút 3</button>
</div>
.btn-group .button {
  background-color: #4CAF50;
  border: 1px solid green;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  font-size: 16px;
  cursor: pointer;
  width: 150px;
  display: block;
}

.btn-group .button:not(:last-child) {
  border-bottom: none;/* Ngăn hai đường viền */
}

.btn-group .button:hover {
  background-color: #3e8e41;
}

External CSS

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External JavaScript

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