canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  background: url("https://www.passthatime.com/i/background2.jpg");
  background-position: center center;
  background-origin: content-box;
  background-size: cover;
  background-attachment: fixed;
  z-index: -2;
}
/* First lets set a background */
.bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("https://www.passthatime.com/i/background2.jpg");
  background-position: center center;
  background-origin: content-box;
  background-size: cover;
  background-attachment: fixed;
  z-index: -2;
}

/* Now the same background, but with brightness filters*/
.lightning {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("https://www.passthatime.com/i/background2.jpg");
  background-position: center center;
  background-origin: content-box;
  background-size: cover;
  background-attachment: fixed;
  -webkit-filter: brightness(3);
  filter: brightness(3);
  -o-filter: brightness(3);
  -moz-filter: brightness(3);
  z-index: -1;
}

/*Now just a opacity animation*/
.flashit {
  -webkit-animation: flash ease-out 7s infinite;
  -moz-animation: flash ease-out 7s infinite;
  animation: flash ease-out 7s infinite;
  animation-delay: 2s;
}

@-webkit-keyframes flash {
  from {
    opacity: 0;
  }
  92% {
    opacity: 0;
  }
  93% {
    opacity: 0.6;
  }
  94% {
    opacity: 0.2;
  }
  96% {
    opacity: 0.9;
  }
  to {
    opacity: 0;
  }
}

@keyframes flash {
  from {
    opacity: 0;
  }
  92% {
    opacity: 0;
  }
  93% {
    opacity: 0.6;
  }
  94% {
    opacity: 0.2;
  }
  96% {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}
/*End! is that simple! */

/*Now just some stupid logo to get some look and feel */
#logo {
  z-index: 1000;
  width: 100%;
  font-size: 3rem;
  color: white;
  position: fixed;
  top: 50%;
  left: 50%;
  margin-left: -18rem;
  margin-top: -2rem;
  font-weight: 900;
}
#logo span {
  font-weight: 100;
}

html,
body {
  font-family: "Titillium Web", "lato", sans-serif;
}
@import url(https://fonts.googleapis.com/css?family=Titillium+Web:200,900|Lato:100,300,900);

@media screen and (max-width: 630px) {
  #logo {
    font-size: 3rem;
    margin-left: -9rem;
    margin-top: -1rem;
  }
}