CSS Gradient Animation

my.css

background: linear-gradient(320deg, #000000, #000000, #5785b8, #374a5f, #0e2b4d, #5785b8, #000000);
background-size: 1400% 1400%;
-webkit-animation: blvkGradientBG 45s ease infinite;
-moz-animation: blvkGradientBG 45s ease infinite;
-o-animation: blvkGradientBG 45s ease infinite;
animation: blvkGradientBG 45s ease infinite;
@-webkit-keyframes blvkGradientBG {
    0%{background-position:11% 0%}
    50%{background-position:90% 100%}
    100%{background-position:11% 0%}
}
@-moz-keyframes blvkGradientBG {
    0%{background-position:11% 0%}
    50%{background-position:90% 100%}
    100%{background-position:11% 0%}
}
@-o-keyframes blvkGradientBG {
    0%{background-position:11% 0%}
    50%{background-position:90% 100%}
    100%{background-position:11% 0%}
}
@keyframes blvkGradientBG {
    0%{background-position:11% 0%}
    50%{background-position:90% 100%}
    100%{background-position:11% 0%}
}