CSS Gradient Animation

my.css

background: linear-gradient(131deg, #1b9475, #1b7e94, #1b4894, #281b94, #531b94, #891b94, #941b1f, #94411b, #948c1b, #51941b, #1b9430);
background-size: 2200% 2200%;
-webkit-animation: AnimationName 60s ease infinite;
-moz-animation: AnimationName 60s ease infinite;
-o-animation: AnimationName 60s ease infinite;
animation: AnimationName 60s ease infinite;
@-webkit-keyframes AnimationName {
    0%{background-position:2% 0%}
    50%{background-position:99% 100%}
    100%{background-position:2% 0%}
}
@-moz-keyframes AnimationName {
    0%{background-position:2% 0%}
    50%{background-position:99% 100%}
    100%{background-position:2% 0%}
}
@-o-keyframes AnimationName {
    0%{background-position:2% 0%}
    50%{background-position:99% 100%}
    100%{background-position:2% 0%}
}
@keyframes AnimationName {
    0%{background-position:2% 0%}
    50%{background-position:99% 100%}
    100%{background-position:2% 0%}
}