<div class="coupon">
  <div class="price">200<small>元</small></div>
  <div class="info">
    <h3>新人满减卷</h3>
    <p>满800元可用</p>
    <p>有效期至2020.12.28</p>
  </div>
</div>

body {
  display: flex;
  align-items: center;
  justify-content: center;
  text-rendering: optimizeSpeed;
  height: 100vh;
  background-color: #eee;
}
.coupon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-around;
  width: 300px;
  height: 120px;
  padding: 0 30px;
  box-sizing: border-box;
  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
  border-radius: 4px;
  background-image: radial-gradient(circle at right center, transparent, transparent 10px, #fff 10px);
}
.price {
  font-size: 44px;
  color: red;
  font-weight: bold;
}
.price small {
  margin-left: 6px;
  font-size: 12px;
}
.info h3,
.info p {
  margin: 4px;
}
.info p {
  font-size: 12px;
  color: #666;
}