donate.css

.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #000, #222, #000, #222, #000, #222, #000);
    background-size: 300% 300%;
    animation: backgroundAnimation 20s linear infinite alternate;
    z-index: -1;
  }
  
  @keyframes backgroundAnimation {
    0% {
      background-position: 0 0;
    }
    100% {
      background-position: 100% 100%;
    }
  }