.Button_Loader {
    width:55px;
    height:23px;
    background:
        radial-gradient(circle closest-side,#ffffff 90%,#0000) 0%   50%,
        radial-gradient(circle closest-side,#ffffff 90%,#0000) 50%  50%,
        radial-gradient(circle closest-side,#ffffff 90%,#0000) 100% 50%;
    background-size:calc(100%/4) 100%;
    background-repeat: no-repeat;
    animation:d7 0.8s infinite linear;
}
@keyframes d7 {
    33%{background-size:calc(100%/4) 0%  ,calc(100%/4) 100%,calc(100%/4) 100%}
    50%{background-size:calc(100%/4) 100%,calc(100%/4) 0%  ,calc(100%/4) 100%}
    66%{background-size:calc(100%/4) 100%,calc(100%/4) 100%,calc(100%/4) 0%  }
}