css-animations-gradient-background.css

/*Add animated CSS gradient to your form background*/
.gradient_wrapper {
      background: linear-gradient(45deg, #2455EB, #24DDEB, #59EB24);
      background-size: 600% 600%;
      animation: GradientBackground 9s ease-in infinite;
      border:none!important;
}

@keyframes GradientBackground {
      0% {
        background-position: 0% 50%;
      }
    
      50% {
        background-position: 100% 50%;
      }
    
      100% {
        background-position: 0% 50%;
      }
}