Modo nocturno.

// ==UserScript==
// @name 3DScript Nocturno22
// @namespace Violentmonkey Scripts
// @grant none
// @include     http://www.3djuegos.com/*
// ==/UserScript==

/*Modo noche*/

var dark = document.createElement("span");
dark.style.zIndex = "999";
dark.style.top = "7px";
dark.style.right = "7px";
dark.style.backgroundColor = "rgba(255, 255, 255, 0.6)";
dark.style.borderRadius = "2px";
dark.style.padding = "10px";
dark.style.position = "fixed";
dark.style.cursor = "pointer";
dark.innerHTML = "Dark";
dark.addEventListener("click", toggle_color);
body.appendChild(dark);

function toggle_color() {
    /*foros*/
    if(window.location.href.indexOf("foro") > -1){

    var color_f1 = document.getElementsByClassName("dtf list_foros_1  caja_list_foro");
    for(i=0;i<color_f1.length;i++){
        color_f1[i].style.backgroundColor= "#5e5e5e";
    }
    var color_f2 = document.getElementsByClassName("dtf list_foros_0  caja_list_foro");
    for(i=0;i<color_f2.length;i++){
        color_f2[i].style.backgroundColor = "#444";
    }
    var color_f3 = document.getElementsByClassName("s12 c6");
    for(i=0;i<color_f3.length;i++){
        color_f3[i].style.color = "white";
    }
    var color_f4 = document.getElementsByClassName("lin1");
    for(i=0;i<color_f4.length;i++){
        color_f4[i].style.height = "0px";
    }
    var barraForos = document.getElementsByClassName("alicia2")[0].children[0];
    for(i = 0; i < barraForos.children.length; i++){
        if(barraForos.children[i].className == "off"){
            barraForos.children[i].style.background = "-webkit-linear-gradient(top,#737272,#313131)";
            barraForos.children[i].style.border = "1px solid #5F5C5C";

        }
    }
    var contenedorUser = document.getElementsByClassName("main msg_degra");
    var contenedorUser2 = document.getElementsByClassName("cab_msg");
    for(i = 0; i < contenedorUser.length; i++){

        contenedorUser[i].style.textShadow = "none";
        contenedorUser2[i].style.border = "1px solid #929090";
        contenedorUser2[i].style.background = "#444444";
        contenedorUser[i].children[1].style.backgroundColor = "#5E5E5E";

    }
    var bordeCitas = document.getElementsByClassName("cita_borF");
    var bordeCitas2 = document.getElementsByClassName("fftit a_col_plat_hover mar_t10 cita_degra");
    for(i = 0; i < bordeCitas.length; i++){
        bordeCitas[i].style.border = "none";
    }
    for(i = 0; i < bordeCitas2.length; i++){
        bordeCitas2[i].style.borderColor = "#929090";
    }

    /*foros*/

    /*temas*/

    var color = document.getElementsByClassName("bgcF");
    for(i=0;i<color.length;i++){
        color[i].style.backgroundColor = "#444";
    }
    var color2 = document.getElementsByClassName("mar_foros_cab");
    for(i=0;i<color2.length;i++){
        color2[i].style.backgroundColor = "#444";
    }
    var color3 = document.getElementsByClassName("bgcEB");
    for(i=0;i<color3.length;i++){
        color3[i].style.backgroundColor = "#5e5e5e";
    }
    var color4 = document.getElementsByClassName("sombra_foros");
    for(i=0;i<color4.length;i++){
        color4[i].style.height = "0px";
    }
    var color5 = document.getElementsByClassName("bg_gris_tit_nav");
    for(i=0;i<color5.length;i++){
        color5[i].style.backgroundImage = "url(http://i.imgur.com/oDl0PSN.png)";
    }
    var color6 = document.getElementsByClassName("ts110F");
    for(i=0;i<color6.length;i++){
        color6[i].style.textShadow = "0px 0px 0px transparent";
    }
    var color7 = document.getElementsByClassName("no_select caja_gris_opc_p6 mar_t6 pr");
    for(i=0;i<color7.length;i++){
        color7[i].style.backgroundColor = "#5e5e5e";
    }
    var color8 = document.getElementsByClassName("sombra_msg");
    for(i=0;i<color8.length;i++){
        color8[i].style.backgroundImage = "url(http://i.imgur.com/oDl0PSN.png)";
    }
    var color9 = document.getElementsByClassName("b_fw5");
    for(i=0;i<color9.length;i++){
        color9[i].style.color = "whitesmoke";
    }
    var color10 = document.getElementsByClassName("cita_borF");
    for(i=0;i<color10.length;i++){
        color10[i].style.backgroundColor = "#5e5e5e";
    }
    var color11 = document.getElementsByClassName("pad_t9 pepon dn");
    for(i=0;i<color11.length;i++){
        color11[i].style.color = "whitesmoke";
    }
    var color12 = document.getElementsByClassName("dib");
    for(i=0;i<color12.length;i++){
        color12[i].style.color = "white";
        color12[i].style.textShadow = "0px 0px 0px transparent";
    }
    var color13 = document.getElementsByClassName("c3 fi");
    for(i=0;i<color13.length;i++){
        color13[i].style.color = "white";
    }
    var color14 = document.getElementsByClassName("cita_tit b s9 he24");
    for(i=0;i<color14.length;i++){
        color14[i].style.backgroundColor = "#5e5e5e";
    }
    var color14 = document.getElementsByClassName("s12 lh21 c4 n");
    for(i=0;i<color14.length;i++){
        color14[i].style.color = "white";
    }
    var color15 = document.getElementsByClassName("cita_tit b s11 bgcEF");
    for(i=0;i<color15.length;i++){
        color15[i].style.backgroundColor = "#5e5e5e";
    }
    var color16 = document.getElementsByClassName("cita");
    for(i=0;i<color16.length;i++){
        color16[i].style.backgroundColor = "#5e5e5e";
        color16[i].style.borderRadius = 0 + 'px';
    }
    var color17 = document.getElementsByClassName("s30 c2 fftit fw7");
    for(i=0;i<color17.length;i++){
        color17[i].style.color = "white";
    }
    var color18 = document.getElementsByClassName("c2 fw5");
    for(i=0;i<color18.length;i++){
        color18[i].style.color = "white";
    }
    var color19 = document.getElementsByClassName("s14 c2 b");
    for(i=0;i<color19.length;i++){
        color19[i].style.color = "white";
    }
    var color20 = document.getElementsByClassName("s14 b c0 pad_3");
    for(i=0;i<color20.length;i++){
        color20[i].style.color = "white";
    }
    var color21 = document.getElementsByClassName("cab_msg");
    for(i=0;i<color21.length;i++){
        //color21[i].style.backgroundColor = "#5e5e5e";
    }
    var color22 = document.getElementsByClassName('boton b_s14 fl');
    for(i=0;i<color22.length;i++){
        color22[i].style.border = "0px";
        color22[i].style.color = "#444";
        color22[i].style.textShadow = "0px 0px 0px transparent";
    }
    var color23 = document.getElementsByClassName("s28 c2");
    for(i=0;i<color23.length;i++){
        color23[i].style.color = "white";
    }
    var color24 = document.getElementsByClassName("pad_t6 c0");
    for(i=0;i<color24.length;i++){
        color24[i].style.color = "white";
    }
    var color25 = document.getElementsByClassName("c0 db fl");
    for(i=0;i<color25.length;i++){
        color25[i].style.color = "white";
    }
    var color26 = document.getElementsByClassName("sombra_msg");
    for(i=0;i<color26.length;i++){
        color26[i].style.visibility = "hidden";
    }
    var color27 = document.getElementsByClassName("vota_grande offvota_grande off");
    for(i=0;i<color27.length;i++){
        color27[i].style.color = "white";
    }
    var color28 = document.getElementsByClassName("s17 c1");
    for(i=0;i<color28.length;i++){
        color28[i].style.color = "white";
    }
    var color29 = document.getElementsByClassName("editado");
    for(i=0;i<color29.length;i++){
        color29[i].style.color = "white";
    }
    var color30 = document.getElementsByClassName("img");
    for(i=0;i<color30.length;i++){
        color30[i].style.background = "#5e5e5e";
    }
    var color31 = document.getElementsByClassName("tabla_main");
    for(i=0;i<color31.length;i++){
        color31[i].style.background = "#5e5e5e";
    }
    /*var color32 = document.getElementsByClassName("off");
    for(i=0;i<color32.length;i++){
        color32[i].style.background = "-webkit-linear-gradient(top,#5e5e5e,#5e5e5e)";
        color32[i].style.color = "white";
    }*/
    }

    /*temas*/

    /*perfil*/
    if(window.location.href.indexOf("comunidad") > -1) {
       var color_p1 = document.getElementsByClassName("bgcEB");
    for(i=0;i<color_p1.length;i++){
        color_p1[i].style.background = "#5e5e5e";
    }
    var color_p2 = document.getElementsByClassName("caja_main mar_b16");
    for(i=0;i<color_p2.length;i++){
        color_p2[i].style.background = "#444";
    }
    var color_p3 = document.getElementsByClassName("caja_der s12 mar_b16");
    for(i=0;i<color_p3.length;i++){
        color_p3[i].style.background = "#444";
    }
    var color_p4 = document.getElementsByClassName("ts110F4");
    for(i=0;i<color_p4.length;i++){
        color_p4[i].style.color = "white";
        color_p4[i].style.textShadow = "0px 0px 0px transparent";
    }
    var color_p5 = document.getElementsByClassName("s12 c4 a_n lh17 ts110F4 degra_desc_mi_foto pr break");
    for(i=0;i<color_p5.length;i++){
        color_p5[i].style.background = "-webkit-linear-gradient(top,transparent,transparent)";
    }
    var color_p6 = document.getElementsByClassName("s12 c3 lh16 break pr pad_tb5");
    for(i=0;i<color_p6.length;i++){
        color_p6[i].style.color = "white";
    }
    var color_p7 = document.getElementById("lista_pref_der");
    color_p7.style.color = "white";

    var color_p8 = document.getElementsByClassName("c3");
    for(i=0;i<color_p8.length;i++){
        color_p8[i].style.color = "white";
    }

    var color_p9 = document.getElementsByClassName("tb100 s12 c2");
    for(i=0;i<color_p9.length;i++){
        color_p9[i].style.color = "white";
    }
    var color_p10 = document.getElementsByClassName("mar_t10");
    for(i=0;i<color_p10.length;i++){
        color_p10[i].style.color = "white !important";
    }
    var color_p11 = document.getElementsByTagName("tr");
    for(i=0;i<color_p11.length;i++){
        color_p11[i].style.backgroundColor = "#444";
    }
    var color_p12 = document.getElementsByClassName("caja_main");
    for(i=0;i<color_p12.length;i++){
        color_p12[i].style.backgroundColor = "#444";
                color_p12[i].style.color = "white";

    }
    var color_p13 = document.getElementsByClassName("url_act");     //Falta la B
    for(i=0;i<color_p13.length;i++){
        color_p13[i].style.color = "white";
    }
    var color_p14 = document.getElementsByTagName("b");
    for(i=0;i<color_p14.length;i++){
        color_p14[i].style.color = "white";
    }

    var color_p15 = document.getElementsByClassName("s12 c2");
    for(i=0;i<color_p15.length;i++){
        color_p15[i].style.color = "white";
    }
    var color_p16 = document.getElementsByTagName("span");
    for(i=0;i<color_p16.length;i++){
        color_p16[i].style.color = "white";
    }
    var color_p17 = document.getElementsByClassName("c8");
    for(i=0;i<color_p17.length;i++){
        color_p17[i].style.color = "white";
    }
    var color_p18 = document.getElementsByClassName("s12 c6");
    for(i=0;i<color_p18.length;i++){
        color_p18[i].style.color = "white";
    }

    }
    /*perfil*/
}
/*Modo noche*/