JSFiddle - React, Tailwind, and code Playground

HTML

<div class="holder">
    <h3>Neki naslov, malo dulji...</h3>
    <div class="inner"></div>
</div>

CSS

.holder {
    background: #00A3EF;
    font-family: sans-serif;
    padding: 5px;
    position: relative;
}

.inner {
    background-image: -ms-linear-gradient(right, #FFFFFF 0%, #00A3EF 100%);
    background-image: -moz-linear-gradient(right, #FFFFFF 0%, #00A3EF 100%);
    background-image: -o-linear-gradient(right, #FFFFFF 0%, #00A3EF 100%);
    background-image: -webkit-gradient(linear, right top, left top, color-stop(0, #FFFFFF), color-stop(1, #00A3EF));
    background-image: -webkit-linear-gradient(right, #FFFFFF 0%, #00A3EF 100%);
    background-image: linear-gradient(to left, #FFFFFF 0%, #00A3EF 100%);
    height: 100%;
    position: absolute;
    right: 0;
    top: 0;
    width: 60%;
}