效果展示

5元
优惠券
5元 优惠券

制作步骤

核心 CSS 属性mask
https://developer.mozilla.org/zh-CN/docs/Web/CSS/mask

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<div class="box">
  <div class="content">
    <div>5元 优惠券</div>
  </div>
</div>
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.box {
  position: relative;
  width: 300px;
  height: 150px;
  filter: drop-shadow(0px 0px 1px rgba(0, 0, 0, 0.5));
}
.box::before {
  content: '';
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  background: #fdb716;
  -webkit-mask: radial-gradient(
        circle at 20px 20px,
        transparent 20px,
        red 0
      )-20px -20px /50% 100%, radial-gradient(
        circle at 5px 5px,
        transparent 5px,
        red 0
      )-155px -5px/100% 9%;
  -webkit-mask-composite: source-in;
}
.box .content {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  font-weight: bold;
  font-size: 36px;
}