<div class="container">
  <h2>Oops! Page not found.</h2>
  <h1>404</h1>
  <p>We can't find the page you're looking for.</p>
  <a href="#">Go back home</a>
</div>

body{
  margin: 0;
  padding: 0;
  font-family: "montserrat",sans-serif;
  min-height: 100vh;
  background-image: linear-gradient(125deg,#6a89cc,#b8e994);
}

.container{
  width: 100%;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  text-align: center;
  color: #343434
}

.container h1{
  font-size: 160px;
  margin: 0;
  font-weight: 900;
  letter-spacing: 20px;
  background: url(https://res.cloudinary.com/drcrre4xg/image/upload/v1571761599/bg_g4leql.jpg) center no-repeat;
  -webkit-text-fill-color: transparent;
  -webkit-background-clip: text;
}

.container a{
  text-decoration: none;
  background: #e55039aa;
  color: #fff;
  padding: 12px 24px;
  display: inline-block;
  border-radius: 25px;
  font-size: 14px;
  text-transform: uppercase;
  transition: 0.4s;
}

.container a:hover{
  background: #e55039;
}

/*
* Link: https://www.darkcode.info/2019/10/create-404-error-page-using-html-css.html
*/