CSS Gradient Animation

my.css

background: linear-gradient(138deg, #2dc39d, #4082c9);
background-size: 400% 400%;
-webkit-animation: MoveBG 6s ease infinite;
-moz-animation: MoveBG 6s ease infinite;
-o-animation: MoveBG 6s ease infinite;
animation: MoveBG 6s ease infinite;
@-webkit-keyframes MoveBG {
    0%{background-position:50% 0%}
    50%{background-position:50% 100%}
    100%{background-position:50% 0%}
}
@-moz-keyframes MoveBG {
    0%{background-position:50% 0%}
    50%{background-position:50% 100%}
    100%{background-position:50% 0%}
}
@-o-keyframes MoveBG {
    0%{background-position:50% 0%}
    50%{background-position:50% 100%}
    100%{background-position:50% 0%}
}
@keyframes MoveBG {
    0%{background-position:50% 0%}
    50%{background-position:50% 100%}
    100%{background-position:50% 0%}
}