JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper-sidebar">
    <div id="content-sidebar" class="text-center">
        	<h1> hello</h1>

        <p>welcome to the admin panel</p>
        <p>have a nice stay!</p>
    </div>
</div>

CSS

#wrapper-sidebar {
    margin: 0 auto;
    width: 300px;
    height: 100%;
    padding: 0;
    position: absolute;
}
#content-sidebar {
    background-color: #f5f5f5;
    border: 1px solid #e3e3e3;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
    -moz-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
    height: 100%;
    padding-top: 5px;
}
.text-center {
    text-align: center;
}