.droparea {
  display: flex;
  min-height: 400px;
  padding: 50px 0;
  font-size: 24px;
  line-height: 2.5;
  color: #999;
  text-align: center;
  border: 3px solid #eee;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.pre-wrap {
  display: flex;
  width: 100%;
  height: 400px;
  padding: 0;
  overflow: hidden;
  text-align: center;
  background: linear-gradient(45deg, #fff 25%, transparent 25%, transparent 75%, #fff 75%), linear-gradient(-45deg, transparent 25%, #ccc 25%, #ccc 75%, transparent 75%), linear-gradient(45deg, transparent 25%, #fff 25%, #fff 75%, transparent 75%);
  background-size: 30px 30px;
  border: 3px solid rgba(91, 192, 222, 0.5);
  align-items: center;
  justify-content: center;
}

.pre-wrap img {
  width: auto;
  max-width: 100%;
  max-height: 400px;
}

h3.h3 {
  display: flex;
  align-items: center;
}