document.addEventListener("DOMContentLoaded", function(event) {
    var h3Decentralization = document.getElementById("h3Decentralization");
    var divDecentralization = document.getElementById("divDecentralization");

    h3Decentralization.addEventListener("click", function() {
        if (divDecentralization.className == "decentralization2"){
            divDecentralization.className = "decentralization1";
        }
        else{
            divDecentralization.className = "decentralization2";
        }
    });
});