#particles-js {
position: fixed;
z-index: -999;
width: 100%;
height: 100%; background: #45484d; background: -moz-radial-gradient(center, ellipse cover, #45484d 0%, #000000 100%); background: -webkit-radial-gradient(center, ellipse cover, #45484d 0%,#000000 100%); background: radial-gradient(ellipse at center, #45484d 0%,#000000 100%); filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#45484d', endColorstr='#000000',GradientType=1 ); }