* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html, body {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  background: rgb(2,0,36);
}

body {
  background-color: #111;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-family: "Lucida Console", "Courier New", monospace;
  color: #242424;
}
.x7 span.red {
  color: #992929;
}
.x7 {
  margin: 123px auto;
  font-size: 4rem;
  position: relative;
}
.x7 span {
  position: relative;
  display: inline-block;
  animation: flip 4s infinite;
  animation-delay: calc(.3s * var(--i))
}
@keyframes flip {
  0%,80% {
    transform: rotateY(360deg) 
  }
}