Chrome or Firefox (possibly other browsers) users should install Tampermonkey and create a new script, then copy the code below. For further installation help check out this post from earlier this week with in-depth instruction..!

// ==UserScript==
// @name          Steemit.com Night Mode
// @namespace     http://userstyles.org
// @description   Easier CSS on the eyes for Steemit.
// @author        KLYE
// @include       http://steemit.com/*
// @include       https://steemit.com/*
// @include       http://*.steemit.com/*
// @include       https://*.steemit.com/*
// @run-at        document-start
// @version       0.0.3
// ==/UserScript==

(function() {var css = [
    ".VerticalMenu>li>a:hover {",
    "background-color: #040404;",
    "}",
    ".UserProfile__top-nav .menu>li>a:hover {",
    "background-color: transparent;",
    "border-radius: 15px;",
    "}",
    ".UserProfile__top-nav .menu>li>a.active {",
    "background-color: #000;",
    "z-index: 2;",
    "color: #4ba2f2;",
    "font-weight: 700;",
    "}",
    "table tbody td, table tbody th {",
    "background: #000 !important;",
    "}",
    ".UserWallet__balance.UserWallet__balance.zebra {",
    "background: #000 !important;",
    "}",
        ".App__content, div.Header__top.header, .UserProfile__top, .drag-and-drop, .App, .index-page, .PostSummary__content, .PostSummary, .Header, .menu, div.Header__sub-nav.expanded.show-for-medium.row, .Reputation, .PostsList__post_container {",
           "background-color: none !important;",
    "background: #000 !important;",
        "}",
        " .Header__sub-nav li>a {",
"border: none !important;",
    "}",
            " #body {",
"color: #000 !important;",
    "min-height: 100%",
    "}",
    ".PostsList__post_container .PostFull, .ReplyEditor__options select  {",
    "background-color: #000 !important;",
    "color: #ccc !important;",
"}",
    "[type=text], textarea[rows], code, .ReplyEditor__title, .dropzone, .upload-enabled, .category, .Markdown blockquote>p {",
    "background-color: #111 !important;",
    "color: #ccc !important;",
    "}",
    ".SubmitPost {",
    "min-height: 1000px !important;",
    "}",
    ".UserProfile__top-nav {",
    "background-color: #000;",
    "padding: 0;",
    "}",
    ".UserProfile__banner>div.column, .UserProfile__banner>div.columns {",
   " background: #23579d;",
    "background: linear-gradient(180deg,#1a4072 0,#000);",
   " min-height: 155px;",
"}",
    ".callout {",
    "background-color: #000;",
    "color: #ccc;",
    "}",
    "div.Header__top.header {",
    "border-bottom: #000 !important;",
    "}"
].join("\n");

if (typeof GM_addStyle != "undefined") {
    GM_addStyle(css);
} else if (typeof PRO_addStyle != "undefined") {
    PRO_addStyle(css);
} else if (typeof addStyle != "undefined") {
    addStyle(css);
} else {
    var node = document.createElement("style");
    node.type = "text/css";
    node.appendChild(document.createTextNode(css));
    var heads = document.getElementsByTagName("head");
    if (heads.length > 0) {
        heads[0].appendChild(node);
    } else {
        // no head yet, stick it whereever
        document.documentElement.appendChild(node);
    }
}
})();

	VOTE @KLYE FOR WITNESS steemit.com/~witnesses