body {
  position: relative;
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  transform: translate(-50%, -50%) rotate(30deg);
  transform-origin: center;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='200'%3E%3Ctext x='0' y='50%25' dominant-baseline='middle' font-size='3rem' fill='rgba(0,0,0,0.1)'%3Eあっと夫婦のプログラミング教室%3C/text%3E%3C/svg%3E") repeat-y;
  background-size: auto 200px;
  pointer-events: none;
  z-index: -1;
  animation: scrollText 15s linear infinite;
}

body::after {
  content: "";
  position: fixed;
  top: 6rem;
  left:30%;
  margin: 0;
  width: 100%;
  height: 100%;
  transform: translate(-50%, -50%) rotate(30deg);
  transform-origin: center;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' height='200'%3E%3Ctext x='0' y='50%25' dominant-baseline='middle' font-size='3rem' fill='rgba(0,0,0,0.1)'%3Eあっと夫婦のプログラミング教室%3C/text%3E%3C/svg%3E") repeat-y;
  background-size: auto 200px;
  pointer-events: none;
  z-index: -1;
  animation: scrollText 15s linear infinite;
}

@keyframes scrollText {
  from {
    transform: translateX(100vw);
  }
  to {
    transform: translateX(calc(-1% - 100vw));
  }
}