Dark theme enabler for Rocket.Chat. Theme taken from https://github.com/0x0049/Rocket.Chat.Dark

rocket_theme_dark.js

var ThemeEnabler = {

	isThemeOn: false,

	controls: null,

	onAppLoaded: async function() {
		this.checkCookie()

		do {
			await this._sleep(100);
			// console.log("... waiting for footer");
		} while (!$('footer')[0])
		// console.log("Footer found!");
		this.addControls();
		this.updateControls();
	},

	checkCookie: function () {
		var theme = this.getCookie('_theme');
		if (theme == 'black') {
			this.applyTheme()
		}
	},

	addControls: function () {
		this.controls = $('<span title="...and never look back." style="color: #444; margin-left: 10px; position: relative; top: -5px;">Go Black</span>');
		this.controls.appendTo('footer.sidebar__footer');
		var self = this;
		this.controls.on('click', function () {
			if (self.isThemeOn) {
				self.eraseCookie('_theme');
				$('style#theme-black').remove();
				self.isThemeOn = false;
			} else {
				self.createCookie('_theme', 'black', 100);
				self.applyTheme();
			}
			self.updateControls();
		})
	},

	updateControls: function () {
		if (this.isThemeOn) {
			this.controls.text("Go Blackn't");
		} else {
			this.controls.text("Go Black");
		}
	},

	applyTheme: function () {
		this.isThemeOn = true;
		$('<style id="theme-black" type="text/css">' + this.__theme__ + '</style>').appendTo('head');
	},

	__theme__: `
		::-webkit-input-placeholder{color:#5b6068!important}:-moz-placeholder{color:#5b6068!important}::-moz-placeholder{color:#5b6068!important}:-ms-input-placeholder{color:#5b6068!important}:root:root{--badge-unread-background:#7289da;--rc-color-button-primary:#7289da;--rc-color-primary:#c2c3c5;--rc-color-primary-lightest:#2f3236;--rc-color-primary-dark:#2c2e32;--rc-color-primary-darkest:#282a2e;--status-online:#43b581;--status-away:#fcb316;--status-busy:#f04747;--status-invisible:#bbb;--popover-background:#2a2c31;--popover-title-color:#bbb;--popover-item-color:#bbb;--popover-divider-color:#26282c;--sidebar-background:#2f3136;--badge-background:#3e4147;--sidebar-item-hover-background:#292b2f;--sidebar-item-popup-background:#292b2f;--message-box-container-border-color:#505257;--rc-color-error:#f04747;--create-channel-title-color:#c2c3c5;--tags-border-color:#505257;--popup-list-background:#2a2c31;--popup-list-name-color:#bbb;--popup-list-background-hover:#7289da;--popup-list-selected-background:#7289da;--tags-text-color:#fff;--tags-background:#7289da;--message-box-markdown-color:#c2c3c5;--message-box-markdown-hover-color:#5f6164;--message-box-user-typing-user-color:#7289da;--header-background-color:#36393e;--header-title-username-color-darker:#c2c3c5;--color-darkest:#7c7e81;--tooltip-background:#2a2c31;--rc-color-alert-message-primary-background:#2a2c31;--rc-color-alert-message-secondary-background:#2a2c31;--chip-background:#7289da;--header-title-status-color:#9a9c9f;--color-gray-lightest:#c2c3c5}.color-primary-font-color{color:#dcddde}.content-background-color,.full-page,.loading-animation,.page-loading,body,html{background-color:#36393e}.rc-old #login-card{background-color:#2a2c31}.secondary-background-color{background-color:#2a2c31}.border-secondary-background-color{border-color:#3d4048}.border-component-color{border:#313338}.background-component-color,.background-primary-action-color{background-color:#7289da}.background-info-font-color,.background-transparent-darker-before::before{background-color:#7289da}.secondary-font-color{color:#e2e7f7}.button,.button.primary,.rc-button{background-color:#7289da;color:#e2e7f7;border:none}.button.primary:hover,.button:hover,.rc-button:hover{color:#e2e7f7;background-color:#5873d3;opacity:1!important}.button.primary[disabled],.button[disabled],.rc-button[disabled]{background-color:#54618c;color:#8c909a}.rc-button--outline{background-color:transparent;border:2px solid #7289da;color:#7289da}.rc-button--outline:hover{background-color:transparent;border-color:#5873d3;color:#5873d3}.rc-button--outline[disabled]{background-color:transparent;border-color:#54618c;color:#54618c}.button.danger,.rc-button--cancel{background-color:#f04747;color:#fcdada}.button.danger:hover,.rc-button--cancel:hover{background-color:#ee2a2a;color:#fcdada;opacity:1!important}.button.danger[disabled],.rc-button--cancel[disabled]{background-color:#934042;color:#99898c}.rc-button--cancel.rc-button--outline{background-color:transparent;border:2px solid #f04747;color:#f04747}.rc-button--cancel.rc-button--outline:hover{background-color:transparent;border-color:#ee2a2a;color:#ee2a2a}.rc-button--cancel.rc-button--outline[disabled]{background-color:transparent;border-color:#934042;color:#934042}.button.secondary,.rc-button--secondary{background-color:#bbb;color:#2a2c31}.button.secondary:hover,.rc-button--secondary:hover{background-color:#a8a8a8;color:#2a2c31;opacity:1!important}.button.secondary[disabled],.rc-button--secondary[disabled]{background-color:#787a7c;color:#32353a}.flex-tab .loading-animation>div,.loading-animation>div,.main-content .loading-animation>div{background-color:#bbb}.rc-header,.rc-old .fixed-title{border-bottom:1px solid #313338;-webkit-box-shadow:none;box-shadow:none}.messages-container .footer{background:0 0;border-top-style:solid;border-top-width:1px;-webkit-box-shadow:0 1px 2px -1px #424449;box-shadow:0 1px 2px -1px #424449}.messages-box .start{color:#888;text-transform:uppercase;font-weight:700;font-size:12px}.message a{color:#7289da}.message a:hover{color:#5873d3}.message .mention-link{background-color:transparent}.avatar{-webkit-box-shadow:1px 1px 3px 0 rgba(0,0,0,.5);box-shadow:1px 1px 3px 0 rgba(0,0,0,.5)}.sidebar{-webkit-box-shadow:1px 0 2px -1px rgba(0,0,0,.5);box-shadow:1px 0 2px -1px rgba(0,0,0,.5);border-right:1px solid #2f3136}.rc-old .flex-tab-container .flex-tab-bar{background-color:#2f3136;border-left:1px solid #313338;-webkit-box-shadow:-1px 0 2px -1px rgba(0,0,0,.5);box-shadow:-1px 0 2px -1px rgba(0,0,0,.5)}.rc-old .flex-tab-container .flex-tab-bar .tab-button-icon{color:#bbb;fill:#bbb}.rc-old .flex-tab-container .flex-tab-bar .tab-button.active,.rc-old .flex-tab-container .flex-tab-bar .tab-button:hover{background-color:#2f3136}.contextual-bar,.flex-tab .content,.flex-tab .list-view,.flex-tab .user-view,.rc-user-info-container{background-color:#2f3136}.rc-user-info-details{background-color:#2a2c31}.rc-user-info-details__info{color:#bbb;font-size:.9em}.rc-user-info-details__label{font-size:1em;margin-bottom:.5em}.flex-tab input:focus,.flex-tab select:focus,.flex-tab textarea:focus{border-color:#565d71}.flex-tab .channel-settings .button,.flex-tab .channel-settings .buttons .button{background-color:#2a2c31;color:#bbb}.flex-tab .channel-settings .button:hover,.flex-tab .channel-settings .buttons .button:hover{background-color:#26282c;color:#c2c2c2}.emoji-top .emoji-filter .search,.flex-tab .channel-settings .editing,.rc-input__element,.rc-old #login-card .input-line input,.rc-old #login-card .input-line select,.rc-old input[type=email],.rc-old input[type=number],.rc-old input[type=password],.rc-old input[type=text],.rc-old input[type=url],.rc-old select,.rc-tags,input,select,textarea{background-color:#303337;border:2px solid #505257;border-radius:2px!important}.emoji-top .emoji-filter .search:focus,.flex-tab .channel-settings .editing:focus,.rc-input__element:focus,.rc-old #login-card .input-line input:focus,.rc-old #login-card .input-line select:focus,.rc-old input[type=email]:focus,.rc-old input[type=number]:focus,.rc-old input[type=password]:focus,.rc-old input[type=text]:focus,.rc-old input[type=url]:focus,.rc-old select:focus,.rc-tags:focus,input:focus,select:focus,textarea:focus{border-color:#565d71!important}.emoji-top .emoji-filter .search[disabled],.flex-tab .channel-settings .editing[disabled],.rc-input__element[disabled],.rc-old #login-card .input-line input[disabled],.rc-old #login-card .input-line select[disabled],.rc-old input[type=email][disabled],.rc-old input[type=number][disabled],.rc-old input[type=password][disabled],.rc-old input[type=text][disabled],.rc-old input[type=url][disabled],.rc-old select[disabled],.rc-tags[disabled],input[disabled],select[disabled],textarea[disabled]{background-color:#43474d;border-color:#606369}.rc-input__element,.toolbar .rc-input__element,input,select,textarea{color:#b8b9bb}.message.new-day::before{background-color:#36393e;color:#727477}.message.new-day::after{border-color:#3e4045}.flex-tab .message.new-day::before{background-color:#2f3136;color:#4e4f54}.flex-tab .message.new-day::after{border-color:#37393e}.rc-old .list-view.uploaded-files-list .file-name{color:#7289da;border-bottom-color:#393b41}.rc-old .list-view.uploaded-files-list .file-name:hover{color:#8095de;text-decoration:none}.flex-tab a i,.flex-tab a[class^=icon-],.message a i,.message a[class^=icon-]{color:#686d78}.flex-tab a i:hover,.flex-tab a[class^=icon-]:hover,.message a i:hover,.message a[class^=icon-]:hover{color:#7c818d}.rc-old .code-colors,code{background-color:#2a2c31;border-color:#282a2f;border-radius:2px;color:#c2c3c5;font-weight:400}.filter-item{border-color:#838383}.filter-item .category-link{color:#838383}.filter-item:hover{border-color:#a8a8a8}.filter-item:hover .category-link{color:#a8a8a8}.filter-item.active{border-color:#7289da}.filter-item.active .category-link{color:#7289da}.emoji-picker .emojis .emoji-list li:hover{background-color:#222327}.rc-old .message{margin-top:40px}.rc-old .message .message-actions{bottom:4px;top:auto}.rc-old .message::after{border-top:1px solid #3f4349;content:" ";display:block;left:0;pointer-events:none;position:absolute;top:-20px;width:100%}.rc-old .message.sequential{padding-top:0;margin-top:0}.rc-old .message.sequential::after{display:none}.rc-old .message.sequential .message-actions{bottom:auto;top:0}.rc-old .message.first-unread .body::before{background-color:#7289da;top:-20px}.rc-old .message.first-unread .body::after{background-color:#36393e;color:#7289da;top:-25px}.rc-old .message.first-unread.sequential{margin-top:10px}.rc-old .message.first-unread.sequential .body::before{top:-6px}.rc-old .message.first-unread.sequential .body::after{top:-12px}.rc-old .message.first-unread.new-day::before{color:#7289da}.rc-old .message.first-unread.new-day::after{border-color:#7289da}.rc-old .compact .message{min-height:0;padding-top:2px;padding-bottom:2px}.rc-old .compact .message .message-actions{bottom:0}.message .reactions>li{background-color:#2a2c31;border-color:#2a2c31;color:#7289da}.message .reactions>li.selected{background-color:#2a2c31;background-color:#7289da;border-color:#7289da;color:#fff}.message .reactions>li.add-reaction{border:none}.input.checkbox.toggle label:before,.rc-switch--blue .rc-switch__button,.rc-switch__button{background-color:#bbb;border-color:#bbb}.flex-nav .input.checkbox.toggle input:checked+label:before,.input.checkbox.toggle 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.popup-item.selected{background-color:#7289da}.rc-room-actions{color:var(--color-darkest)}.sidebar-item__menu-icon{fill:currentColor}.rc-input__icon,.rc-message-box .rc-icon,.rc-message-box__toolbar-markdown-link{color:#7c7e81}.rc-input__icon:hover,.rc-message-box .rc-icon:hover,.rc-message-box__toolbar-markdown-link:hover{color:#96989a;fill:#96989a}.contextual-bar .rc-popup-list__list{background-color:#2a2c31}@media (max-width:500px){.rc-message-box{margin-top:0}.rc-message-box__container{border:none}}.flex-tab .channel-settings .buttons{bottom:1px;top:0}.flex-tab .channel-settings .buttons .button{padding:7px}.rc-old #login-card .input-line .input-error{color:#f04747}.burger i{background-color:#c2c3c5}.unread-bar,.unread-bar button{color:#fff}.unread-bar button:hover{color:#e2e7f7}.rc-old .announcement{background-color:#7289da}.rc-user-info__row--separator{border-color:#44474e;margin-bottom:4px}.rc-select{border-color:#505257;cursor:pointer}.rc-select 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.rc-switch-double__label.disabled{color:#bbb}.attachments__name{color:#c2c3c5}.attachments__item:hover{background-color:#2a2c31}.rc-table{color:#c2c3c5}.rc-table-body .rc-table-tr:hover{background-color:#2a2c31}.message .info .is-bot,.message .info .role-tag{background-color:#7289da;color:#fff}.message .body>table tr{border-top-color:#24252a;background-color:#2a2c31}.message .body>table tr{background-color:#2a2c31}.message .body>table tr:nth-child(2n){background-color:#282a2f}.message .body>table tr td,.message .body>table tr th{border-color:#24252a}.rc-old .page-container table,.rc-old .page-settings .section{background-color:#2a2c31}.rc-old .page-settings .section{border:none}.rc-old .page-container table{margin-top:10px}.rc-old .page-container table .admin-table-row,.rc-old .page-container table th{background-color:transparent}.rc-old .page-container table th{border-bottom:1px solid #27282d}.rc-old .page-container table tr:hover th{background-color:#27282d}.rc-old .page-container 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.section-content{background-color:#2a2c31}.range-slider-range{background-color:#36383d;border-color:#36383d}.range-slider-range::-webkit-slider-thumb{background-color:#7289da}.range-slider-range::-webkit-slider-thumb:active,.range-slider-range::-webkit-slider-thumb:hover{background-color:#5873d3}.range-slider-range::-moz-range-thumb{background-color:#7289da}.range-slider-range::-moz-range-thumb:active,.range-slider-range::-moz-range-thumb:hover{background-color:#5873d3}.range-slider-value{background-color:#7289da}.range-slider-value:after{border-right-color:#7289da}.admin-integrations-new-panel .admin-integrations-new-item{border-color:#313338;color:#bbb}.admin-integrations-new-panel .admin-integrations-new-item:hover{background-color:#27282d}.rc-old .page-settings .section .message.new-day::before{background-color:#2a2c31}.rc-old .page-settings .section .attachment-block-border{background-color:#7289da!important}.rc-old .page-container .content .rocket-form fieldset 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	`,

	_sleep: function (ms) {
		return new Promise(resolve => setTimeout(resolve, ms));
	},

	createCookie: function (name, value, days) {
		if (days) {
			var date = new Date();
			date.setTime(date.getTime()+(days*24*60*60*1000));
			var expires = "; expires="+date.toGMTString();
		}
		else var expires = "";
		document.cookie = name+"="+value+expires+";path=/";
	},

	getCookie: function (cname) {
		var name = cname + "=";
		var ca = document.cookie.split(';');
		for(var i = 0; i < ca.length; i++) {
			var c = ca[i];
			while (c.charAt(0) == ' ') {
				c = c.substring(1);
			}
			if (c.indexOf(name) == 0) {
				return c.substring(name.length, c.length);
			}
		}
		return null;
	},

	eraseCookie: function (name) {
		this.createCookie(name,"",-1);
	}
}

$( function() {
	ThemeEnabler.onAppLoaded()
});

// console.log("Custom script executed...");

Usage

Simply paste the script and hit Save. No need to restart the server.

Then enable it using this "button"

Overall very nice, few little things here and there.

Shouldn't look like that. Try force-reloading the page.