html {
}
body {
    height: 96vh;
background-image: url("rainbow.gif");
}
.nav{
	position: relative;
	top: 48%;
    list-style:none;
    margin:0;
    padding:0;
    text-align:center;
}
.nav li{
    display:inline;
}
.nav a{
    display:inline-block;
    padding:10px;
    border-radius: 5px;
    color: white;
    text-decoration: none;

background: #c9de96; /* Old browsers */
background: -moz-linear-gradient(top,  #c9de96 0%, #8ab66b 44%, #398235 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#c9de96), color-stop(44%,#8ab66b), color-stop(100%,#398235)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top,  #c9de96 0%,#8ab66b 44%,#398235 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top,  #c9de96 0%,#8ab66b 44%,#398235 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top,  #c9de96 0%,#8ab66b 44%,#398235 100%); /* IE10+ */
background: linear-gradient(to bottom,  #c9de96 0%,#8ab66b 44%,#398235 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#c9de96', endColorstr='#398235',GradientType=0 ); /* IE6-9 */
}

.nav a:hover {
background: #b4ddb4; /* Old browsers */
background: -moz-linear-gradient(top,  #b4ddb4 0%, #83c783 17%, #52b152 33%, #008a00 67%, #005700 83%, #002400 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#b4ddb4), color-stop(17%,#83c783), color-stop(33%,#52b152), color-stop(67%,#008a00), color-stop(83%,#005700), color-stop(100%,#002400)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top,  #b4ddb4 0%,#83c783 17%,#52b152 33%,#008a00 67%,#005700 83%,#002400 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top,  #b4ddb4 0%,#83c783 17%,#52b152 33%,#008a00 67%,#005700 83%,#002400 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top,  #b4ddb4 0%,#83c783 17%,#52b152 33%,#008a00 67%,#005700 83%,#002400 100%); /* IE10+ */
background: linear-gradient(to bottom,  #b4ddb4 0%,#83c783 17%,#52b152 33%,#008a00 67%,#005700 83%,#002400 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#b4ddb4', endColorstr='#002400',GradientType=0 ); /* IE6-9 */
}