animation.css

body {
    background: #cec8aa;
    font-size: 62.5%;
}

p {
    margin: 4px 0;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    font-size: 1rem;
}

h1.title {
    margin: 1.5em 0 1em;
    font-size: 2rem;
    color: white;
}

ul {
    margin: 0;
    padding: 0;
}

.animation-list {
    display: -webkit-inline-flex;
    display: inline-flex;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-align-items: flex-start;
    align-items: flex-start;
}

.animation-list li {
    width: 300px;
    height: 320px;
    margin: 4px;
    background: white;
    list-style: none;
    text-align: center;
    border-radius: 5px;
}

.animation {
    position: relative;
    padding: 4px;
    display: block;
    height: 260px;
}

.sector-clipping1 {
    position: absolute;
    width: 100px;
    height: 100px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    -webkit-clip-path: polygon(0 0, 50% 0, 50% 100%, 0 100%);
    clip-path: polygon(0 0, 50% 0, 50% 100%, 0 100%);
}

.sector-clipping1 .inner {
    position: absolute;
    width: 100px;
    height: 100px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    border-radius: 100%;
    background: -moz-linear-gradient(90deg, #4d99d8 50%, transparent 50%, transparent 50%);
    background: -webkit-linear-gradient(90deg, #4d99d8 50%, transparent 50%, transparent 50%);
    background: linear-gradient(90deg, #4d99d8 50%, transparent 50%, transparent 50%);
    animation: sector-clipping1 2s ease-out 0s infinite normal forwards running;
}

@keyframes sector-clipping1 {
    0% {
        transform: rotate(-180deg);
    }
    25% {
        transform: rotate(-180deg);
    }
    50% {
        transform: rotate(0deg);
    }
    75% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(180deg);
    }
}

.sector-clipping2 {
    position: absolute;
    width: 100px;
    height: 100px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    -webkit-clip-path: polygon(50% 0, 100% 0%, 100% 100%, 50% 100%);
    clip-path: polygon(50% 0, 100% 0%, 100% 100%, 50% 100%);
}

.sector-clipping2 .inner {
    position: absolute;
    width: 100px;
    height: 100px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    border-radius: 100%;
    background: -moz-linear-gradient(-90deg, #4d99d8 50%, transparent 50%, transparent 50%);
    background: -webkit-linear-gradient(-90deg, #4d99d8 50%, transparent 50%, transparent 50%);
    background: linear-gradient(-90deg, #4d99d8 50%, transparent 50%, transparent 50%);
    animation: sector-clipping2 2s ease-in 0s infinite normal forwards running;
}

@keyframes sector-clipping2 {
    0% {
        transform: rotate(-180deg);
    }
    25% {
        transform: rotate(0deg);
    }
    50% {
        transform: rotate(0deg);
    }
    75% {
        transform: rotate(180deg);
    }
    100% {
        transform: rotate(180deg);
    }
}


/*Gravity rotation*/

.gravity-rotation {
    position: absolute;
    width: 100px;
    height: 100px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

.circle-wrapper {
    position: absolute;
    width: 80px;
    height: 80px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

.circle {
    position: absolute;
    width: 10px;
    height: 10px;
    display: block;
    top: 5;
    left: 0;
    right: 0;
    margin: auto;
    border-radius: 100%;
    background: hsl(155, 29%, 40%);
}

.circle-wrapper:nth-child(1) {
    animation: gravity-rotation 2s cubic-bezier(0.8, 0.2, 0.2, 0.8) 0s infinite normal forwards running;
}

.circle-wrapper:nth-child(2) {
    animation: gravity-rotation 2s cubic-bezier(0.8, 0.2, 0.2, 0.8) .1s infinite normal forwards running;
}

.circle-wrapper:nth-child(3) {
    animation: gravity-rotation 2s cubic-bezier(0.8, 0.2, 0.2, 0.8) .2s infinite normal forwards running;
}

.circle-wrapper:nth-child(4) {
    animation: gravity-rotation 2s cubic-bezier(0.8, 0.2, 0.2, 0.8) .3s infinite normal forwards running;
}

.circle-wrapper:nth-child(5) {
    animation: gravity-rotation 2s cubic-bezier(0.8, 0.2, 0.2, 0.8) .4s infinite normal forwards running;
}

@keyframes gravity-rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}


/*Boxes rotation*/

.boxes-wrapper {
    position: absolute;
    width: 80px;
    height: 30px;
    display: block;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

.boxes-wrapper:nth-child(1) {
    animation: boxes-rotation 2s cubic-bezier(0.8, 0, 0.2, 1) .4s infinite normal forwards running;
    background: hsl(27, 33%, 57%);
}

.boxes-wrapper:nth-child(2) {
    animation: boxes-rotation 2s cubic-bezier(0.8, 0, 0.2, 1) .3s infinite normal forwards running;
    background: hsl(66, 33%, 57%);
}

.boxes-wrapper:nth-child(3) {
    animation: boxes-rotation 2s cubic-bezier(0.8, 0, 0.2, 1) .2s infinite normal forwards running;
    background: hsl(160, 33%, 57%);
}

.boxes-wrapper:nth-child(4) {
    animation: boxes-rotation 2s cubic-bezier(0.8, 0, 0.2, 1) .1s infinite normal forwards running;
    background: hsl(204, 33%, 57%);
}

.boxes-wrapper:nth-child(5) {
    animation: boxes-rotation 2s cubic-bezier(0.8, 0, 0.2, 1) 0s infinite normal forwards running;
    background: hsl(332, 33%, 60%);
}

@keyframes boxes-rotation {
    0% {
        transform: rotate(0deg);
    }
    50% {
        transform: rotate(90deg);
    }
    100% {
        transform: rotate(180deg);
    }
}