<div class="box-of-star1">
    <div class="star star-position1"></div>
    <div class="star star-position2"></div>
    <div class="star star-position3"></div>
    <div class="star star-position4"></div>
    <div class="star star-position5"></div>
    <div class="star star-position6"></div>
    <div class="star star-position7"></div>
  </div>
  <div class="box-of-star2">
    <div class="star star-position1"></div>
    <div class="star star-position2"></div>
    <div class="star star-position3"></div>
    <di