#Header1_HeaderTitle{
  text-decoration: none;
  display: inline-block;
  background: linear-gradient(to bottom right,blue, red);
  height:103px;
  width:310px;
  border: groove;
  animation: myfirst 2s linear;
  -webkit-animation: myfirst 2s linear;
  animation-iteration-count: infinite;
  -webkit-animation-iteration-count: infinite;
}
  @keyframes myfirst {
            0% {
               background: linear-gradient(to bottom right, red,blue);
            }
            25% {
               background: linear-gradient(to bottom right,blue, red);
            }
            50% {
               background: linear-gradient(to bottom right, red,blue);
            }
            75% {
               background: linear-gradient(to bottom right,blue, red);
            }
            100% {
               background: linear-gradient(to bottom right, red,blue);
            }
        }
  @-webkit-keyframes myfirst {
            0% {
               background: linear-gradient(to bottom right, red,blue);
            }
            25% {
               background: linear-gradient(to bottom right,blue, red);
            }
            50% {
               background: linear-gradient(to bottom right, red,blue);
            }
            75% {
               background: linear-gradient(to bottom right,blue, red);
            }
            100% {
               background: linear-gradient(to bottom right, red,blue);
            }
        }