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html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://code.5g-o.com/wp-content/uploads/2020/03/style-6.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" charset="utf-8"></script>
  </head>
  <body>
    <div class="accordion">
      <div class="accordion-item">
        <div class="item-header">
          <h1 class="title">Design</h1>
          <div class="icon">+</div>
        </div>
        <p class="text">
          Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ad magnam obcaecati atque! Quia ipsum temporibus distinctio amet necessitatibus assumenda tempora, nam rerum eum praesentium ducimus molestiae dicta voluptas consectetur quos.
        </p>
      </div>

      <div class="accordion-item">
        <div class="item-header">
          <h1 class="title">Websites</h1>
          <div class="icon">+</div>
        </div>
        <p class="text">
          Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ad magnam obcaecati atque! Quia ipsum temporibus distinctio amet necessitatibus assumenda tempora, nam rerum eum praesentium ducimus molestiae dicta voluptas consectetur quos.
        </p>
      </div>

      <div class="accordion-item">
        <div class="item-header">
          <h1 class="title">Sections</h1>
          <div class="icon">+</div>
        </div>
        <p class="text">
          Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ad magnam obcaecati atque! Quia ipsum temporibus distinctio amet necessitatibus assumenda tempora, nam rerum eum praesentium ducimus molestiae dicta voluptas consectetur quos.
        </p>
      </div>

      <div class="accordion-item">
        <div class="item-header">
          <h1 class="title">Databases</h1>
          <div class="icon">+</div>
        </div>
        <p class="text">
          Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ad magnam obcaecati atque! Quia ipsum temporibus distinctio amet necessitatibus assumenda tempora, nam rerum eum praesentium ducimus molestiae dicta voluptas consectetur quos.
        </p>
      </div>
    </div>

    <script type="text/javascript">
      $(".item-header").click(function(){
        $(".accordion-item").removeClass("active");
        $(this).parent().addClass("active");
        $(".icon").text("+");
        $(this).children(".icon").text("-");
      });
    </script>
  </body>
</html>

css

*{
  margin: 0;
  padding: 0;
  font-family: "Open Sans",sans-serif;
  box-sizing: border-box;
}

body{
  background: #f1f1f1;
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.accordion{
  max-width: 600px;
  padding: 20px;
}

.accordion-item{
  border-bottom: 1px solid #ddd;
  padding: 20px 0;
}

.item-header{
  padding: 14px 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.title{
  font-size: 20px;
  font-weight: 600;
}

.icon{
  width: 28px;
  height: 28px;
  border: 2px solid #000;
  border-radius: 50%;
  text-align: center;
  font-size: 30px;
  font-weight: 700;
  line-height: 25px;
}

.text{
  color: #888;
  padding: 0 6px;
  max-height: 0;
  overflow: hidden;
}

.accordion-item.active .text{
  max-height: 600px;
  transition: .4s linear;
}

在线演示

让链接同时具备两种打开方式