JSFiddle - React, Tailwind, and code Playground

HTML

<button>Make it disappear</button>
<div id="well"></div>

CSS

#well {
    height: 40px;
    background: red;
}
.disappear {
    opacity: .2;
}

JavaScript

$(function () {

    var setClass = JSON.parse(localStorage.getItem('setClass')) || {};
    if (setClass) {
        $.each(setClass, function () {
            $(this.selector).addClass(this.className);
        });
    }
    var addClassToLocalStorage = function(selector, className) {
        setClass[selector + ':' + className] = {
            selector: selector,
            className: className
        };
        localStorage.setItem('setClass', JSON.stringify(setClass));
    };
    var removeClassFromLocalStorage = function(selector, className) {
        delete setClass[selector + ':' + className];
        localStorage.setItem('setClass', JSON.stringify(setClass));
    };

    $('button').on('click', function () {
        $("#well").fadeOut();
        $("#well").addClass("disappear");
        addClassToLocalStorage('#well', 'disappear');
    })
});