JSFiddle - React, Tailwind, and code Playground

HTML

<div class="leftContainer ">
    <div class="header">System Tree</div>
    <div class="mainbody">
        <p>Content</p>
        <p>Content</p>
        <p>Content</p>
        <p>Content</p>
        <p>Content</p>
    </div> 
</div>

CSS

html, body
{
     margin: 0; 
     border: 0 none; 
     padding: 0; 
     overflow: hidden;
}
html, body, #wrapper, #left, #right 
{
     height: 100%; 
     min-height: 400;
}

body
{
    background: #eee; 
}
*:focus { outline:none;border:none;}
.leftContainer 
{
    width:308px;
    max-height: 100%;
    height:100%;
    background-color: #ffffff;
    box-shadow: 0px 0px 7px #292929;
    -moz-box-shadow: 0px 0px 7px #292929;
    -webkit-box-shadow: 0px 0px 7px #292929;
}
.mainbody, .header, .footer
{
    padding: 5px;

}
.mainbody
{
    padding-left: 5px;
    margin-top: 0;
    min-height: 150px;
    max-height: 650px;
    height: 100%;
    background-color: #F9F9F9;
}
.header
{
    padding-top:15px;
    padding-left:80px;
    padding-right:30px;
    height: 40px;
    background-color: #808080;
    color: #FFFFFF;
    font-size: 22px;
    border-bottom: 1px solid #EEE;
    text-align: right;
}

JavaScript

$("div.leftContainer")
    .css("margin-left",-$(this).width())
    .animate({
        marginLeft:0
    }, 2000)
    .animate({
        marginLeft:-140
    }, 2000);