.spin-wrapper {
    position: relative;
    margin: 40px auto;
    background: white;
}

.spin-wrapper,
.spin-wrapper * {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}



.spin-wrapper .pie {
    width: 50%;
    height: 100%;
    transform-origin: 100% 50%;
    position: absolute;

}

.spin-wrapper .spinner {
    border-radius: 100% 0 0 100% / 50% 0 0 50%;
    z-index: 200;
    border-right: none;
    animation: rota 5s linear infinite;
}

.spin-wrapper:hover .spinner,
.spin-wrapper:hover .filler,
.spin-wrapper:hover .mask {
    animation-play-state: running;
}

.spin-wrapper .filler {
    border-radius: 0 100% 100% 0 / 0 50% 50% 0;
    left: 50%;
    opacity: 0;
    z-index: 100;
    animation: opa 5s steps(1, end) infinite reverse;
    border-left: none;
}

.spin-wrapper .mask {
    width: 50%;
    height: 100%;
    position: absolute;
    background: inherit;
    opacity: 1;
    z-index: 300;
    animation: opa 5s steps(1, end) infinite;
}

@keyframes rota {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes opa {
    0% {
        opacity: 1;
    }
    50%,
    100% {
        opacity: 0;
    }
}


/***
 * Paramétrage
 */

.spin-wrapper .mask,
.spin-wrapper .filler,
.spin-wrapper .spinner {
    animation-duration: 5s;
}

.spin-wrapper .pie {
    background: #08C;
    border: 5px solid rgba(0, 0, 0, 0.5);
}

.spin-wrapper {
    width: 250px;
    height: 250px;
}