html, body {
    height: 100%;
    overflow: hidden;
}
main {
    position: relative;
    height: 100%;
}
main::before,main::after {
    box-sizing: border-box;
    position: absolute;
    content: "";
    display: block;
    aspect-ratio: 1;
    width: 60vmin;
    border: 8vmin solid;
    border-radius: 100vw;
    clip-path: polygon(0px 0px, 0px 100%, 50% 100%, 50% 0px);
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-27.5%);
}
main::after {
    clip-path: polygon(100% 0%, 100% 100%, 50% 100%, 50% 100%, 50% 0px);
    transform: translateX(-50%) translateY(-72.5%);
}
main {
    transform: rotate(30deg);
}