html, body {
  height: 100%;
  overflow: hidden;
}

body {
  position: relative;
  margin: 0;
  background: #FBFBFD;
}

span {
  position: absolute;
  width: 40px;
  height: 40px;
  bottom: 0;
  transform: translateY(40px);
  border-radius: 10px;
}