.error-404-container {
  background: url(/img/404Background_Medium.jpg) no-repeat right;
  background-size: cover;
  max-width: 100%;
  height: 100vh;
  display:flex;
  align-items:center;
  justify-content:center;
}

.error-404-cover {
  display: block;
  width: 50%;
  background-color: rgba(255, 255, 255, 0.8);
  text-align: center;
  color: #000000;
  padding: 2%;
}

.error-404-logo{
  display: inline-block;
  height: 50px;
  width: 110px;
  background: url(/img/logos/treffit24.svg) no-repeat;
  background-size: contain;
  margin-top: 50px;
}

.error-404-btn {
  font-size: 17.5px;
  font-weight: bold;
  margin: 25px auto;
  padding: 20px;
  text-transform: uppercase;
  display: block;
  max-width: 360px;
}

.error-404-desc {
  width: 50%;
  margin: 0 auto;
  font-size: 16.8px;
  line-height: 1.43;
  color: #000000;
}

.error-404-btn:hover {
  color: #ffffff;
}

.error-404-login {
  display: inline-block;
  text-decoration: underline;
  color: #000000;
  margin-bottom: 50px;
}

.error-404-login:hover {
  color: #000000;
}

/* For medium screen width */
@media screen and (max-width: 940px) {
  .error-404-cover, .error-404-desc {
    width: 80%;
  }
}

/* For small screen width and height(especially for Landscape mode with small height)*/
@media screen and (max-width: 640px), screen and (max-height: 420px) {
  .error-404-container {
    background: url(/img/404Background_Small.jpg) no-repeat right;
    background-size: cover;
    padding: 0%;
  }

 .error-404-cover {
    height: 100%;
    width: 100%;
    display: block;
    overflow: auto;
  }

  .error-404-btn {
    max-width: 250px;
  }
}