unsatisfiableness

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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Error 404</title>
</head>

// mixins
@mixin breakpoint($point) {
    @if $point==mobile {
        @media (max-width: 480px) and (min-width: 320px) {
            @content ;
        }
    }
}

// keyrames
@keyframes floating {
    from { transform: translateY(0px); }
    65%  { transform: translateY(15px); }
    to   { transform: translateY(-0px); }
}

html {
  height: 100%;
}

body{
  background-image: url('/img/404/star.svg'),linear-gradient(to bottom, #05007A, #4D007D);
  height: 100%;
  margin: 0;
  background-attachment: fixed;
  overflow: hidden;
}

.mars{
  left:0;
  right:0;
  bottom:0;
  position:absolute;
  height: 27vmin;
  background: url('/img/404/mars.svg') no-repeat bottom center;
  background-size: cover;
}

.logo-404{
  position: absolute;
  margin-left: auto;
  margin-right: auto;
  left: 0;
  right: 0;
  top: 16vmin;
  width: 30vmin;

@include breakpoint(mobile){
    top: 45vmin;
  }
}

.meteor{
  position: absolute;
  right: 2vmin;
  top: 16vmin;
}

.title{
  color: white;
  font-family: $nunito-font;
  font-weight: 600;
  text-align: center;
  font-size: 5vmin;
  margin-top: 31vmin;

@include breakpoint(mobile){
    margin-top: 65vmin;
  }
}

.subtitle{
  color: white;
  font-family: $nunito-font;
  font-weight: 400;
  text-align: center;
  font-size: 3.5vmin;
  margin-top: -1vmin;
  margin-bottom: 9vmin;
}

.btn-back{
  border: 1px solid white;
  color: white;
  height: 5vmin;
  padding: 12px;
  font-family: $nunito-font;
  text-decoration: none;
	border-radius: 5px;

&:hover{
    background: white;
    color: #4D007D;
  }

@include breakpoint(mobile){
    font-size: 3.5vmin;
  }
}

.astronaut{
  position: absolute;
  top: 18vmin;
  left: 10vmin;
  height: 30vmin;
	animation: floating 3s infinite ease-in-out;

@include breakpoint(mobile){
    top: 2vmin;
  }
}

.spaceship{
  position: absolute;
  bottom: 15vmin;
  right: 24vmin;

@include breakpoint(mobile){
    width: 45vmin;
    bottom: 18vmin;
  }
}
</style>
<body>
<div class="mars"></div>
<img src="/img/404/404.svg" class="logo-404" />
<img src="/img/404/meteor.svg" class="meteor" />
<p class="title">Oh no!!</p>
<p class="subtitle">
	You’re either misspelling the URL <br /> or requesting a page that's no longer here.
</p>
<div align="center">
	<a class="btn-back" href="#">Back to previous page</a>
</div>
<img src="/img/404/astronaut.svg" class="astronaut" />
<img src="/img/404/spaceship.svg" class="spaceship" />
</body>
</html>