* {
  margin: 0px;
  padding: 0px;
}

body {
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  width: auto;
  white-space: pre-wrap;
  flex-wrap: wrap;
  height: 100vh;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Oxygen,
    Ubuntu,
    Cantarell,
    "Open Sans",
    "Helvetica Neue",
    sans-serif;
  color: white;
  font-size: 12vh;
  font-weight: 600;
}

.box {
  background-color: red;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100vw;
  height: 100vh;
  animation: colors 10s linear infinite;
}

@keyframes colors {
  from {
    filter: hue-rotate(0deg);
  }
  to {
    filter: hue-rotate(360deg);
  }
}