JSFiddle - React, Tailwind, and code Playground

HTML

<div class="gear"></div>
<div class="gear2"></div>

CSS

.gear, .gear2{
    height: 100px;
    width: 100px;
    background: transparent;
    box-shadow: inset 0 0 0px 35px dimgray, inset 0 0 0px 40px #444;
    border-radius: 50%;
    position: relative;
    margin: 20px auto;
    -webkit-animation: rotate 2.4s ease-out 1;
    -moz-animation: rotate 2.4s ease-out 1;
    animation: rotate 2.4s ease-out 1;
}
.gear:before, .gear:after, .gear2:before, .gear2:after {
    height: 20px;
    width: 20px;
    content: '';
    border-radius: 20%;
    position: absolute;
    background: dimgray;
}
.gear:before, .gear2:before{
    box-shadow: 50px 50px 0 0 dimgray, -50px 50px 0 0 dimgray, 0 100px 0 0 dimgray;
    top: -10px; left: 40px;
}
.gear:after, .gear2:after{
    transform: rotate(45deg);
    top: 5px; left: 76px;
    box-shadow: 0px 100px 0 0 dimgray, 50px 50px 0 0 dimgray, -50px 50px 0 0 dimgray;
}
.gear2 {
    top: -28px; left: 62px;
    -webkit-animation: rotate2 2.4s ease-out 1;
    -moz-animation: rotate2 2.4s ease-out 1;
    animation: rotate2 2.4s ease-out 1;
}
@-webkit-keyframes rotate {
    0% {-webkit-transform: rotate(0deg);}
    100% {-webkit-transform: rotate(-360deg);}
}
@-moz-keyframes rotate {
    0% {-moz-transform: rotate(0deg);}
    100% {-moz-transform: rotate(-360deg);}
}
@keyframes rotate {
    0% {transform: rotate(0deg);}
    100% {transform: rotate(-360deg);}
}
@-webkit-keyframes rotate2 {
    0% {-webkit-transform: rotate(0deg);}
    100% {-webkit-transform: rotate(360deg);}
}
@-moz-keyframes rotate2 {
    0% {-moz-transform: rotate(0deg);}
    100% {-moz-transform: rotate(360deg);}
}
@keyframes rotate2 {
    0% {transform: rotate(0deg);}
    100% {transform: rotate(360deg);}
}