#seccion-video {
  margin: 0;
  padding: 0;
/*  Background fallback in case of IE8 & down, or in case video doens't load, such as with slower connections  */
  background: #333;
  background-attachment: fixed;
  background-size: cover;
}


/* The only rule that matters */
#video-background {
/*  making the video fullscreen  */
  position: initial;
  right: 0; 
  bottom: 0;
  min-width: 100%; 
  min-height: 100%;
  max-width: 100%; 
  max-height: 100%;
  width: auto; 
  height: auto;
  z-index: -100;
}