html, body
{
   width: 100%;
   height: 100%;
}
body
{
   background-color: #FFFFFF;
   background-image: url(images/OwnCloud_Astronomy_Coming_Soon.jpg);
   background-attachment: fixed;
   background-position: left top;
   background-repeat: no-repeat;
   background-size: 100% 100%;
   color: #000000;
   font-family: Arial;
   font-weight: normal;
   font-size: 13px;
   line-height: 1.1875;
   margin: 0;
   padding: 0;
}
@media only screen and (max-width: 799px)
{
body
{
   background-color: #FFFFFF;
   background-image: url(images/OwnCloud_Astronomy_Coming_Soon_M.jpg);
   background-attachment: fixed;
   background-position: left top;
   background-repeat: no-repeat;
}
}