（参考サイト） https://saruwakakun.com/html-css/reference/h-design

index.html

<p class="corse_alldrink">飲み放題付きコース</p>

style.css

.corse_alldrink {
  color: #1f1a0a;
  font-size: 2.4rem;
  display: inline-block;
  background: #ffda0a;
  position: relative;
  margin: 0 0 3rem 0;
  padding: 0.5rem 6.6rem 0.5rem 8.2rem;
  z-index: 1;
}

.corse_alldrink:before {
  position: absolute;
  content: "";
  left: -2px;
  top: -2px;
  width: 0;
  height: 0;
  border: none;
  border-left: solid 40px #1f1a0a;
  border-bottom: solid 79px transparent;
  z-index: 2;
}

.corse_alldrink:after {
  position: absolute;
  content: "";
  right: -3px;
  top: -7px;
  width: 0;
  height: 0;
  border: none;
  border-left: solid 40px transparent;
  border-bottom: solid 79px #1f1a0a;
  z-index: 2;
}