JSFiddle - React, Tailwind, and code Playground

by Victor

HTML

<div class="image-uploading">
    <div class="inner"></div>
</div>

CSS

.image-uploading {
    width: 300px;
    height: 20px;
    background: #e7e7e7;
    border-radius: 0px;
    overflow: hidden;
    margin: 80px auto;
   
}
.inner {
    background: #00BCF2;
    width: 50px;
    height: 20px;
    -webkit-animation: NAME-YOUR-ANIMATION 3s infinite;
    -moz-animation:    NAME-YOUR-ANIMATION 3s infinite; 
    -o-animation:      NAME-YOUR-ANIMATION 3s infinite; 
    animation:         NAME-YOUR-ANIMATION 3s infinite; 
}

@-webkit-keyframes NAME-YOUR-ANIMATION {
    0%   { width: 0%; }
    100% { width: 100% }
}
@-moz-keyframes NAME-YOUR-ANIMATION {
    0%   { width: 0%; }
    100% { width: 100% }
}
@-o-keyframes NAME-YOUR-ANIMATION {
    0%   { width: 0%; }
    100% { width: 100% }
}
@keyframes NAME-YOUR-ANIMATION {
    0%   { width: 0%; }
    100% { width: 100% }
}