html {
  position: relative;
   min-height: 100%;
   overflow-x: hidden;
}

body {
  background-color: #000000;
  background:url('../imagenes/hojas-de-vida.jpg') no-repeat center top scroll;
  background-size: cover;
}

#botoncontinuar{
position: absolute;
margin-top: 42%;
margin-left: 50%;
}