img.bg {
  min-height: 100%;
  min-width: 1024px;
  width: 100%;
  height: auto;
  position: fixed;
  top: 0;
  left: 0;
}

@media screen and (max-width: 1024px) { /* Specific to this particular image */
  img.bg {
    left: 50%;
    margin-left: -520px;   /* 50% */
  }
}

img.dark-bg {
  min-height: 100%;
  min-width: 1024px;
  width: 100%;
  height: auto;
  position: fixed;
  top: 0;
  left: 0;
}

@media screen and (max-width: 1024px) { /* Specific to this particular image */
  img.dark-bg {
    left: 50%;
    margin-left: -520px;   /* 50% */
  }
}

/*.bg .image{
  float: left;
}

.bg-1{
  width: 204px;
  height: 290px;
  background: url(../img/bg_greyscale/1.jpg);
}
.bg-2{
  width: 435px;
  height: 289px;
  background: url(../img/bg_greyscale/2.jpg);
}
.bg-3{
  width: 529px;
  height: 380px;
  background: url(../img/bg_greyscale/3.jpg);
}
.bg-4{
  width: 352px;
  height: 254px;
  background: url(../img/bg_greyscale/4.jpg);
}
.bg-5{
  width: 290px;
  height: 253px;
  background: url(../img/bg_greyscale/5.jpg);
}
.bg-6{
  width: 266px;
  height: 192px;
  background: url(../img/bg_greyscale/6.jpg);
}
.bg-7{
  width: 264px;
  height: 193px;
  background: url(../img/bg_greyscale/7.jpg);
}
.bg-8{
  width: 420px;
  height: 269px;
  background: url(../img/bg_greyscale/8.jpg);
}
.bg-9{
  width: 230px;
  height: 279px;
  background: url(../img/bg_greyscale/9.jpg);
}
.bg-10{
  width: 170px;
  height: 261px;
  background: url(../img/bg_greyscale/10.jpg);
}
.bg-11{
  width: 185px;
  height: 258px;
  background: url(../img/bg_greyscale/11.jpg);
}
.bg-12{
  width: 177px;
  height: 114px;
  background: url(../img/bg_greyscale/12.jpg);
}
.bg-13{
  width: 175px;
  height: 129px;
  background: url(../img/bg_greyscale/13.jpg);
}*/