.undertext{
  background-color: invisible;
  position: absolute;
  color: red;
  top: 80px;
  transform: rotate(10deg);
  animation: sized 1s infinite;
}

@keyframes sized{
  0%{transform: rotate(10deg) scale(1.0);}
  50%{transform: rotate(10deg) scale(1.2);}
  100%{transform: rotate(10deg) scale(1.0);}
}