JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box1">
    <img src="#" alt="testing1" class="chart1" />
</div><!-- / .box1 -->

<div class="box2">
    <img src="#" alt="testing2" class="chart2" />
</div><!-- / .box2 -->

CSS

@-webkit-keyframes chart1 {
    0%, 100% { width: 0px; }
    50% { width: 50px; }
}

@-webkit-keyframes chart2 {
    0%, 100% { -webkit-transform: scaleX(0); }
    50% { -webkit-transform: scaleX(1); }
}

.box1, .box2 {
    position: absolute;
        top: 0; left: 0;
    background: blue;
    height: 50px;
    width: 50px;
    overflow: hidden;
    -webkit-transform-origin: 0 0;
}

    .box1 img {
        position: absolute;
            top: 0; left: 0;
        width: 50px;   
    }

.box1 img, .box2 img { background: red; }

.box1 { -webkit-animation: chart1 2s infinite; }

.box2 {
    left: 100px;
    -webkit-animation: chart2 2s infinite;
}