<div class="container">
  <div class="USA-flag">
    <div class="USA-stars">
      <div class="star-row">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row star-row--five">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row star-row--five">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row star-row--five">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row star-row--five">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
      <div class="star-row">
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
        <div class="star">★</div>
      </div>
    </div>
    <div class="USA-stripes">
      <div class="stripe"></div>
      <div class="stripe stripe--white"></div>
      <div class="stripe"></div>
      <div class="stripe stripe--white"></div>
      <div class="stripe"></div>
      <div class="stripe stripe--white"></div>
      <div class="stripe"></div>
      <div class="stripe stripe--white"></div>
      <div class="stripe"></div>
      <div class="stripe stripe--white"></div>
      <div class="stripe"></div>
      <div class="stripe stripe--white"></div>
      <div class="stripe"></div>
    </div>
  </div>
</div>

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100vw;
  background: linear-gradient(90deg, #041E42 20%, #9b1c2c 100%);
}

.USA-flag {
  width: 900px;
  min-width: 900px;
  height: 450px;
  box-shadow: 0px 20px 80px 10px rgba(0,0,0,.25);
  position: relative;
}

.stripe {
  background-color: #9b1c2c;
  width: 100%;
  height: calc(450px / 13);
}
.stripe--white {
   background-color: white;
}

.USA-stars {
  position: absolute;
  top: 0;
  left: 0;
  width: 378px;
  height: calc((450px / 13) * 7);
  background-color: #041E42;
  z-index: 1;
  padding: 12px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.star-row {
  display: flex;
  justify-content: space-between;
}
.star-row--five {
  padding: 0px 33px;
}

.star {
  font-size: 20px;
  color: white;
  display: flex;
  justify-content: center;
  margin-top: -4px;
}

@media (max-width: 1000px) {
  .USA-flag {
    transform: scale(.75);
  }
}
@media (max-width: 725px) {
  .USA-flag {
    transform: scale(.5);
  }
}
@media (max-width: 475px) {
  .USA-flag {
    transform: scale(.375);
  }
}

@media (max-width: 340px) {
  .USA-flag {
    transform: scale(.325);
  }
}