*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}
html,
body {
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background-color: #212121;
  font-family:arial;
}
@keyframes loader_5191 {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.square {
  background: #ddd;
  width: 10px;
  height: 10px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -5px;
  margin-left: -5px;
}

#sq1 {
  margin-top: -25px;
  margin-left: -25px;
  animation: loader_5191 675ms ease-in-out 0s infinite alternate;
}

#sq2 {
  margin-top: -25px;
  animation: loader_5191 675ms ease-in-out 75ms infinite alternate;
}

#sq3 {
  margin-top: -25px;
  margin-left: 15px;
  animation: loader_5191 675ms ease-in-out 150ms infinite;
}

#sq4 {
  margin-left: -25px;
  animation: loader_5191 675ms ease-in-out 225ms infinite;
}

#sq5 {
  animation: loader_5191 675ms ease-in-out 300ms infinite;
}

#sq6 {
  margin-left: 15px;
  animation: loader_5191 675ms ease-in-out 375ms infinite;
}

#sq7 {
  margin-top: 15px;
  margin-left: -25px;
  animation: loader_5191 675ms ease-in-out 450ms infinite;
}

#sq8 {
  margin-top: 15px;
  animation: loader_5191 675ms ease-in-out 525ms infinite;
}

#sq9 {
  margin-top: 15px;
  margin-left: 15px;
  animation: loader_5191 675ms ease-in-out 600ms infinite;
}