<h2>按钮边框颜色</h2> <p>我们可以使用 border 属性设置按钮边框颜色:</p> <button class="button button1">Green</button> <button class="button button2">Blue</button> <button class="button button3">Red</button> <button class="button button4">Gray</button> <button class="button button5">Black</button>