<div id="stars">


 <div class="stars-wrapper">
  <span class="label">評価</span>
  <div class="stars-content">
    <span class="star-icon" data-rate="3.5"></span>
    <span class="rating-number">3.5</span>
  </div>
 </div>

</div>

/* =================================== */
/*   ★★★★★　評価   */
/* =================================== */
#stars .stars-wrapper {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  padding: 10px 20px;
  background-color: #f0f8ff;
}

#stars .label {
  margin-right: 1em;
  color: #ff577f;
  font-size: 2.4rem;
  font-weight: bold;
}

#stars .stars-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

#stars .star-icon {
  position: relative;
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: 0.14em;
}

/* ★グレー */
#stars .star-icon::before {
  content: "★★★★★";
  color: #d9d9d9;
}

/* ★ピンク */
#stars .star-icon::after {
  content: "★★★★★";
  position: absolute;
  left: 0;
  color: #ff577f;
  overflow: hidden;
  z-index: 1;
}
  /* data-xxx="" で設定したデータを指定 data-rate="3.5" */
  #stars .star-icon[data-rate="3.5"]::after {
    width: 70%; 
  }

#stars .rating-number {
  margin-left: 0.5em;
  color: #ff577f;
  font-size: 2.2rem;
  font-weight: bold;
}