404.css

@import url('https://rsms.me/inter/inter.css');
html {
  font-family: 'Inter', sans-serif;
}

html {
  width: 100%;
  text-align: center;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(118deg, #ff0000, #0000ff);
  background-size: 400% 400%;
  animation: AnimationName 30s ease infinite;
}

body {
  color: white;
}

@keyframes AnimationName {
  0% {
    background-position: 0% 51%
  }
  50% {
    background-position: 100% 50%
  }
  100% {
    background-position: 0% 51%
  }
}

body {
  padding: 1em;
  border-radius: 2em;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.274);
  background: #222233;
}

@supports (font-variation-settings: normal) {
  html {
    font-family: 'Inter var', sans-serif;
  }
}

a {
  border-radius: 1em;
  padding: 0.5em;
  text-decoration: none;
  background: white;
  color: black;
}

title {
  font-size: 10em;
  display: block;
  font-weight: bold;
}