.background-blur{position:fixed;left:0;right:0;top:0;bottom:0;z-index:-1;display:block;background-attachment:fixed;background-size:cover;-o-background-size:cover;-moz-background-size:cover;-webkit-background-size:cover;width:100%;height:100%;margin:auto}.blur-low{-moz-filter:blur(3px);-o-filter:blur(3px);-ms-filter:blur(3px);filter:blur(3px)}.blur-normal{-moz-filter:blur(20px);-o-filter:blur(20px);-ms-filter:blur(20px);filter:blur(20px)}.blur-high{-moz-filter:blur(50px);-o-filter:blur(50px);-ms-filter:blur(50px);filter:blur(50px)}