html - 元素不选择类

Question

我根本不明白哪里出了问题。谁能帮我一下？我正在尝试自定义按钮，但它不会选择类。

<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
  <input type="hidden" name="cmd" value="_s-xclick">
  <input type="hidden" name="hosted_button_id" value="GAEUPE4GXM68E">
  <input type="submit" value="Instant Buy" name="submit" title="PayPal – The safer, easier way to pay online." class="paypal-btn">
  <img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1">
</form>


.paypal_btn {
  display: inline-block;
  font-family: inherit;
  font-size: 14px;
  font-weight: bold;
  color: #fff;
  text-align: center;
  padding: 10px 14px;
  margin: 0;background: #ff6600;
  border: 0;
  cursor: pointer;
  outline: none;
}

Answer 1

该类是“paypal-btn”(由破折号分隔)，在您的 css 中放置“.paypal_btn”(由下划线分隔)