JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container-fluid">
</div>

CSS

.container{
    width:300px;
    height:300px;
    background:red;
}
.container-fluid{
    width:300px;
    height:300px;
    background:blue;
}

JavaScript

$(window).load(function(){
    var windowWidth = $(window).width();
    var container = $('.container');
    var containerFluid = $('.container-fluid');
    if(windowWidth < 600){
        containerFluid.removeClass('container-fluid').addClass('container');
    }else if (windowWidth > 600){
        container.removeClass('container').addClass('container-fluid');
    }
});