404error.css

:root {
  --mainBgColor: #003b75;
  --mainTxtColor: #d8d8d8;
}

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

body {
  height: 100vh;
  width: 100%;
  background-color: var(--mainBgColor);
  color: var(--mainTxtColor);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
  overflow: hidden;
}

h1 {
  font-size: 10em;
  z-index: 9;
  text-shadow: -1px -1px 1px #efede3, 0px 1px 0 #2e2e2e, 0px 2px 0 #2c2c2c, 0px 3px 0 #2a2a2a,
    0px 4px 0 #282828, 0px 5px 0 #262626, 0px 6px 0 #242424, 0px 7px 0 #222, 0px 8px 0 #202020,
    0px 9px 0 #1e1e1e, 0px 10px 0 #1c1c1c, 0px 11px 0 #1a1a1a, 0px 12px 0 #181818,
    0px 13px 0 #161616, 0px 14px 0 #141414, 0px 15px 0 #121212, 2px 20px 5px rgba(0, 0, 0, 0.9),
    5px 23px 5px rgba(0, 0, 0, 0.3), 8px 27px 8px rgba(0, 0, 0, 0.5),
    8px 28px 35px rgba(0, 0, 0, 0.9);
}

h2 {
  font-size: 4em;
  z-index: 9;
}

svg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70vh;
  height: auto;
  opacity: 0.95;
  z-index: 2;
}

.first {
  position: relative;
  display: inline-block;
  font-size: 1em;
  animation: slide 5s ease-in-out 1s infinite;
}

.second {
  position: relative;
  display: inline-block;
  font-size: 1em;
  animation: slide 5s ease-in-out 1.4s infinite;
}

.third {
  font-size: 1.5em;
  position: relative;
  display: inline-block;
  font-size: 1em;
  animation: slide2 5s ease-in-out 1.8s infinite;
}

@keyframes slide {
  0% {
    opacity: 1;
    transform: translate(0px, 0px);
    animation-timing-function: ease-in;
  }

  50% {
    opacity: 0.1;
    transform: translate(0px, 80px) scale(0) rotateX(180deg) rotateY(90deg);
    animation-timing-function: ease-out;
  }

  100% {
    opacity: 1;
    transform: translate(0px, 0px);
  }
}

@keyframes slide2 {
  0% {
    opacity: 1;
    transform: translate(0px, 0px);
    animation-timing-function: ease-in;
  }

  50% {
    opacity: 0.1;
    transform: translate(0px, 80px) scale(0) rotateX(-270deg) rotateY(-90deg);
    animation-timing-function: ease-out;
  }

  100% {
    opacity: 1;
    transform: translate(0px, 0px);
  }
}

#bug {
  display: block;
  color: aliceblue;
  width: 70px;
  height: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 1;
  opacity: 0.3;
  animation: rolling linear 20s infinite;
}

@keyframes rolling {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.heada {
  display: inline-block;
  transform: rotate(160deg);
}

.headf {
  display: inline-block;
  transform: rotate(-10deg);
}

.headd {
  display: inline-block;
  padding: 0 10px;
  transform: rotate(90deg) translateX(6px);
}

#anchorBtn {
  position: relative;
  display: block;
  background-color: var(--mainTxtColor);
  margin-top: 5em;
  padding: 1em 2em;
  border-radius: 10px;
  text-decoration: none;
  outline: none;
  font-weight: bold;
  color: black;
  mix-blend-mode: screen;
  text-shadow: none;
  z-index: 4;
  transition: .3s;
}

#anchorBtn:hover {
  text-shadow: 0 0 3px #13589c;
}

/* Media queries */

@media only screen and (max-width: 600px) {
  h1 {
    font-size: 6em;
  }

  h2 {
    font-size: 2em;
  }

  svg {
    width: 90vw;
  }

  #bug {
    width: 50px;
    animation: rolling linear 20s infinite;
  }

  #anchorBtn {
    bottom: -100px;
  }
}