JSFiddle - React, Tailwind, and code Playground

HTML

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

<div class="box2">
    <div>
        <img src="#" alt="testing1" class="chart2" />
    </div>
</div><!-- / .box2 -->

CSS

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

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

.box1, .box2 {
    position: absolute;
    top: 0;
    left: 0;
    background: blue;
    height: 150px;
    width: 50px;
    overflow: hidden;
}
.box2 {
    left: 150px;
}
.box1 div, .box2 div {
    position: relative;
    width: 50px;   
    height: 50px;
}
.box1 img, .box2 img {
    background: red;
    position: absolute;
    top: 0;
    left: 0;
}

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

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