body {
  overflow: hidden;
}

.okvir {
  position: relative;
  background: radial-gradient(hsl(210, 70%, 50%), hsl(210, 50%, 30%));
}

.drop {
  position: absolute;
  height: 30px;
  width: 30px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
  filter: blur(6px);
  -webkit-filter: blur(6px);
}