function light_mode() {
    document.body.className = document.body.className.replace("darkmode", "").replace("sunsetmode", "").replace("lightmode", "");
    document.body.className += " lightmode";
}

function sunset_mode() {
    document.body.className = document.body.className.replace("darkmode", "").replace("sunsetmode", "").replace("lightmode", "");
    document.body.className += " sunsetmode";
}

function dark_mode() {
    document.body.className = document.body.className.replace("darkmode", "").replace("sunsetmode", "").replace("lightmode", "");
    document.body.className += " darkmode";
}