* {
    box-sizing: border-box !important;
}

body {
    margin: 0;
    padding: 0;
    background: #233637;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

html {
    font-size: 62.5%;
}

.c3 {
    width: 26rem;
    height: 26rem;
    background-color: #ff4040;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.c2 {
    width: 21rem;
    height: 21rem;
    background-color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.c1 {
    width: 16rem;
    height: 16rem;
    background-color: #ff4040;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.center {
    width: 11rem;
    height: 11rem;
    background-color: blue;
    border-radius: 50%;
    position: relative;
}

.arrow {
    position: absolute;
    border-top: 3.5rem solid white;
    border-left: 4.8rem solid transparent;
    border-right: 4.8rem solid transparent;
    border-bottom: 4.8rem solid transparent;
    width: 0;
    height: 0;
}

.top {
    top: 3.9rem;
    left: .7rem;
}

.left {
    top: 2.1rem;
    left: -1.7rem;
    transform: rotate(72deg);
}

.right {
    top: 2.1rem;
    left: 3.1rem;
    transform: rotate(-72deg);
}