$(document).ready(function (){
    if (localStorage.getItem('night') == 'true'){
        $('#switchCheckbox').prop('checked',true);
        $('body').addClass('night');
        $('section').addClass('night-details');
    }
    $('#switchCheckbox').change(function (){
        if (this.checked){
            $('body').addClass('night');
            $('section').addClass('night-details');
            localStorage.setItem('night',true);
        }else{
            $('body').removeClass('night');
            $('section').removeClass('night-details');
            localStorage.clear('night');
        }
    });
});