* {
    box-sizing: border-box; /*if we add border or padding, it doesn't affect the width of it. */
}

:root {
    --body-color: rgb(255, 255, 255);
    --length-kin: 80px;

    --color-first: rgba(255, 0, 0, 0.8);
    --color-second: rgba(0, 0, 255, 0.8);
}

body {
    background-color: var(--body-color);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden; /*don't want scroll bar to appear.*/
    margin: 0px;
}

.kinetic {
    position: relative;
    height: var(--length-kin);
    width: var(--length-kin);
}

.kinetic::after, .kinetic::before {
    content: '';
    position: absolute;
    top: 0px;
    left: 0px;
    width: 0px;
    height: 0px;
    border: 50px solid transparent;
    border-bottom-color: #fff;
    animation: rotateTriangle1 3s linear infinite;
}

.kinetic::before {
    transform: rotate(90deg);
    animation: rotateTriangle2 4s linear infinite;
}

@keyframes rotateTriangle1 {
    
    0% {
        transform: rotate(0deg);
        border-bottom-color: var(--color-first);
    }

    25% {
        transform: rotate(90deg);
        border-bottom-color: var(--color-first);
    }

    50% {
        transform: rotate(180deg);
        border-bottom-color: var(--color-first);
    }

    75% {
        transform: rotate(270deg);
        border-bottom-color: var(--color-first);
    }

    100% {
        transform: rotate(360deg);
        border-bottom-color: var(--color-first);
    }
}

@keyframes rotateTriangle2 {
     
    0% {
        transform: rotate(90deg);
        border-bottom-color: var(--color-second);
    }

    25% {
        transform: rotate(180deg);
        border-bottom-color: var(--color-second);
    }

    50% {
        transform: rotate(270deg);
        border-bottom-color: var(--color-second);
    }

    75% {
        transform: rotate(360deg);
        border-bottom-color: var(--color-second);
    }

    100% {
        transform: rotate(450deg);
        border-bottom-color: var(--color-second);
    }
}