body {
  overflow: hidden;
}

#sroub {
  width: 300px;
  height: 300px;
  -webkit-animation: spin 1s linear infinite;
  -moz-animation: spin 1s linear infinite;
  animation: spin 1s linear infinite;
  position: absolute;
  right: -100px;
  bottom: -100px;
}

@-moz-keyframes spin {
  100% {
    -moz-transform: rotate(-360deg);
  }
}
@-webkit-keyframes spin {
  100% {
    -webkit-transform: rotate(-360deg);
  }
}
@keyframes spin {
  100% {
    -webkit-transform: rotate(-360deg);
    transform: rotate(-360deg);
  }
}