.spinner {
    --size: 30px;
    --first-block-clr: #005bba;
    --second-block-clr: #fed500;
    --clr: #111;
    width: 100px;
    height: 100px;
    position: relative;
}

    .spinner::after, .spinner::before {
        box-sizing: border-box;
        position: absolute;
        content: "";
        width: var(--size);
        height: var(--size);
        top: 50%;
        animation: up 2.4s cubic-bezier(0, 0, 0.24, 1.21) infinite;
        left: 50%;
        background: var(--first-block-clr);
    }

    .spinner::after {
        background: var(--second-block-clr);
        top: calc(50% - var(--size));
        left: calc(50% - var(--size));
        animation: down 2.4s cubic-bezier(0, 0, 0.24, 1.21) infinite;
    }

@keyframes down {
    0%, 100% {
        transform: none;
    }

    25% {
        transform: translateX(100%);
    }

    50% {
        transform: translateX(100%) translateY(100%);
    }

    75% {
        transform: translateY(100%);
    }
}

@keyframes up {
    0%, 100% {
        transform: none;
    }

    25% {
        transform: translateX(-100%);
    }

    50% {
        transform: translateX(-100%) translateY(-100%);
    }

    75% {
        transform: translateY(-100%);
    }
}