CSS
body {
background: ;
background-image: -webkit-linear-gradient(left, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 100%);
background-image: -khtml-linear-gradient(left, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 100%);
background-image: -moz-linear-gradient(left, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 100%);
background-image: -ms-linear-gradient(left, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 100%);
background-image: -o-linear-gradient(left, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 100%);
background-image: linear-gradient(left, rgba(0,0,0,1) 0%, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 100%);
background-position: 50% 50%;
background-size: 2px 2px;
}