.loaderSistemaPrincipal {
    display: inline-block;
    position: relative;
    width: 64px;
    height: 64px;
}
.loaderSistemaPrincipal div {
    position: absolute;
    border: 4px solid #fed;
    opacity: 1;
    border-radius: 50%;
    animation: loaderSistemaPrincipal 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}
.loaderSistemaPrincipal div:nth-child(2) {
    animation-delay: -0.5s;
}
@keyframes loaderSistemaPrincipal {
    0% {
        top: 28px;
        left: 28px;
        width: 0;
        height: 0;
        opacity: 1;
    }
    100% {
        top: -1px;
        left: -1px;
        width: 58px;
        height: 58px;
        opacity: 0;
    }
}