.main-loader {
    width: 65px;
    aspect-ratio: 1;
    border-radius: 50%;
    background: 
    radial-gradient(farthest-side,#3f4686 100%,#0000) top/9px 9px no-repeat,
    conic-gradient(#0000 30%,#3f4686);
    -webkit-mask: radial-gradient(farthest-side,#0000 calc(100% - 9px),#000 0);
    animation: l13 1s infinite linear;
}
@keyframes l13 { 
    100%{transform: rotate(1turn)}
}