JSFiddle - React, Tailwind, and code Playground

HTML

<div id="sidebar_container">
<div id="sidebar"></div>
<div id="sidebar_close">Schließen</div>
</div>

CSS

#sidebar_container
{
	position: fixed;
	height: 100%;
}
#sidebar
{
	-webkit-animation: sidebar_slide_in 4s linear 1s 1 normal forwards;
    animation: sidebar_slide_in 4s linear 1s 1 normal forwards;
    
	background-color: #444;
	height: 100%;
	width: 200px;
	position: fixed;
	left: -200px;
	top: 0px;
	-webkit-box-shadow:	0px 0px 12px 0px rgba(15, 15, 15, 0.5);
	-moz-box-shadow: 0px 0px 12px 0px rgba(15, 15, 15, 0.5);
	box-shadow:	0px 0px 12px 0px rgba(15, 15, 15, 0.5);
	z-index:200;
}
/* Chrome, Safari, Opera */
@-webkit-keyframes sidebar_slide_in {
    from {left: -200px;}
    to {left: 0px;}
}

/* Standard syntax */
@keyframes sidebar_slide_in {
    from {left: -200px;}
    to {left: 0px;}
} 

#sidebar_close {
	background-color: #444;
	color: #fff;
	text-align: center;
	width: 95px;
	height: 25px;
	line-height: 25px;
	vertical-align: middle;
	font-size: 14px;
	display: inline-block;
	position: absolute;
	top: 50%;
	left: -150px;
	-ms-transform: rotate(270deg); /* IE 9 */
    -webkit-transform: rotate(270deg); /* Chrome, Safari, Opera */
    transform: rotate(270deg);
    -webkit-box-shadow:	0px 0px 0px 0px rgba(15, 15, 15, 0.5);
	-moz-box-shadow: 0px 0px 0px 0px rgba(15, 15, 15, 0.5);
	box-shadow:	0px 2px 5px 0px rgba(15, 15, 15, 0.5);
	border-bottom-left-radius: 6px;
	border-bottom-right-radius: 6px;
	padding: 2px;
	cursor:pointer;
	z-index:100;
	
	-webkit-animation: sidebar_slide_in_button 2s linear 2s 1 normal forwards; 
    animation: sidebar_slide_in_button 2s linear 3s 1 normal forwards;
}
/* Chrome, Safari, Opera */
@-webkit-keyframes sidebar_slide_in_button {
    from {left: 0px;}
    to {left: 150px;}
}

/* Standard syntax */
@keyframes sidebar_slide_in_button {
    from {left: 0px;}
    to {left: 150px;}
} 

#sidebar_close:active {	  
	-webkit-animation: sidebar_slide_in_button_rev 4s linear 3s 1 normal forwards;
    animation: sidebar_slide_in_button_rev 4s linear 3s 1 normal forwards;
}


/* Chrome, Safari, Opera */
@-webkit-keyframes...