one <div>

Cloud

Soft cloud from overlapping circles via box-shadow and pseudo-elements.

HTML + CSS
<div class="od od-cloud"></div>

.od {
  position: relative;
  display: block;
  box-sizing: border-box;
}
.od::before,
.od::after {
  content: '';
  position: absolute;
  box-sizing: border-box;
}

.od-cloud {
  width: 70px; height: 40px; background: #fff; border-radius: 40px;
  box-shadow: 0 10px 24px rgba(15,23,42,0.12);
}
.od-cloud::before {
  width: 42px; height: 42px; border-radius: 50%; background: #fff; top: -22px; left: 8px;
}
.od-cloud::after {
  width: 52px; height: 52px; border-radius: 50%; background: #fff; top: -28px; left: 28px;
}