JSFiddle - React, Tailwind, and code Playground

HTML

<div id="layout">
            <div id="fixed-sidebar">
            </div>
            <div id="content">  
                content to make error visible ! 
            </div>
        </div>

CSS

* { 
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

#layout { 
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

#fixed-sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 460px;
    background-color: rgb(33, 40, 46);
    overflow: hidden;
    padding: 20px;
    color: white;
}

#content {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 460px;
    overflow-y: scroll;
    padding: 20px;
    background-color: lightgrey;
}

@media screen and (min-width: 1151px) {
    #fixed-sidebar { width: 460px; }
    #content { left: 460px; }
}

@media screen and (max-width: 1150px) and (min-width: 700px) {
    #fixed-sidebar { width: 40%; }
    #content { left: 40%; }
}