body, html {
  height: 100%;
  margin: 0;
}
.bg {
  /* The image used */
  background-image: url("404.jpg");

  /* Full height */
  height: 100%; 

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;   
}
#texto {
    top: 135px;
    display: block;
    text-align: center;
    line-height: 150%;
    font-size: .85em;
    color: #181236;
    font-weight: bold;
}