JSFiddle - React, Tailwind, and code Playground

HTML

<div class="arm2"></div>

CSS

.arm2 {
    width: 26px;
    height: 24px;
    top: 0px;
    position: relative;
    background-image: url("http://i.cubeupload.com/BL1fTM.png");
    
    -webkit-animation: play 4s infinite;
       -moz-animation: play 4s infinite;
        -ms-animation: play 4s infinite;
         -o-animation: play 4s infinite;
            animation: play 4s infinite;
}

@-webkit-keyframes play {
    0% { -webkit-transform: rotate(0deg); }
    50% { -webkit-transform: rotate(20deg); }
    100% { -webkit-transform: rotate(0deg); }
}

@-moz-keyframes play {
    0% { -webkit-transform: rotate(0deg); }
    50% { -webkit-transform: rotate(20deg); }
    100% { -webkit-transform: rotate(0deg); }
}

@-ms-keyframes play {
    0% { -webkit-transform: rotate(0deg); }
    50% { -webkit-transform: rotate(20deg); }
    100% { -webkit-transform: rotate(0deg); }
}

@-o-keyframes play {
    0% { -webkit-transform: rotate(0deg); }
    50% { -webkit-transform: rotate(20deg); }
    100% { -webkit-transform: rotate(0deg); }
}

@keyframes play {
    0% { -webkit-transform: rotate(0deg); }
    50% { -webkit-transform: rotate(20deg); }
    100% { -webkit-transform: rotate(0deg); }
}