body,
html {
  height: 100%;
  margin: 0;
  padding: 0;
  background-color: black;
}

#container {
  position: relative;
  width: 100vw;
  height: 100vh;
  border: 1px solid black;
  overflow: hidden;
}

#blob {
  position: absolute;
  width: 50px;
  height: 50px;
  background-color: #7e53ba;
  border-radius: 50%;
}