MetaFilter unicorn and narwhal buttons with laser kitty (Modern)

Shows unicorn and narwhal buttons on the comment form, and a laser kitty on deleted posts (for logged-in members)
换行
// ==UserScript==
// @name            MetaFilter unicorn and narwhal buttons with laser kitty (Modern)
// @namespace       https://gf.qytechs.cn/users/2049-rf14
// @description     Shows unicorn and narwhal buttons on the comment form, and a laser kitty on deleted posts (for logged-in members)
// @version         4.0
// @homepage        https://gf.qytechs.cn/en/scripts/7265-metafilter-unicorn-and-narwhal-buttons-with-laser-kitty
// @include         http://metafilter.com/*
// @include         http://*.metafilter.com/*
// @include         https://metafilter.com/*
// @include         https://*.metafilter.com/*
// @match           http://metafilter.com/*
// @match           http://*.metafilter.com/*
// @match           https://metafilter.com/*
// @match           https://*.metafilter.com/*
// @grant           none
// ==/UserScript==
//
// This is an update of the awesome script created by Rhomboid, and is shared
//  here with his permission.  Modified by rangefinder 1.4.  Also available
//  as a user style for Stylus add-on.
//
// Version 4.0: 2020-01-11 - Replaced GM_addStyle (deprecated in 
//  Greasemonkey 4.0). (Thanks to Tehhund for reporting the issue)
//  Also added @updateURL and @downloadURL for auto update support.
//  *Tampermonkey should still work with version 3.1 of this userscript, so 
//  if you use Tampermonkey, you don't have to update unless you want 
//  automatic updates.*
//
// Version 3.1: 2016-08-21 - (Minor syntax cleanup...version 3.0 still works
//  for me.)  Added "Modern" to @name to distinguish it from Rhomboid's script 
//  name.  Removed extra ";" in "box-shadow" line and some extra spaces.
//
// Version 3.0: 2014-12-31 - Updated version 2.0 of Rhomboid's script to add
//  compatibility for Modern theme (fixed Preview button, added text wrap on
//  Post button, stopped background image from changing position on hover);
//  general style enhancements for buttons (text legibility, highlighted
//  border on hover).
//
// The images are from Rhomboid's original scripts:
// * Narwhal by cubecrazy2: http://cubecrazy2.deviantart.com/
//  (original link is 404: http://cubecrazy2.deviantart.com/The-Great-Narwhal-15457455)
// * Unicorn and laser kitty source unknown.

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

addGlobalStyle('input#postButton {' +
            '  height: 100px !important;' +
            '  width: 100px !important;' +
            '  white-space: normal !important;' +
            '  color: #000 !important;' +
            '  font-weight: bolder !important;' +
            '  background: #fff url(' + unicorn() + ') no-repeat center !important;' +
            '  border: 1px solid #5c5c5c !important;' +
            '  text-shadow: 0 0 0.3em #fff, 0 0 0.3em #fff, 0 0 0.3em #fff, 0 0 0.3em #fff !important;' +
            '}' +
            'input[value="Preview"], input.button[value="Preview"], input#previewButton {' +  // .button and #previewButton for metatalk
            '  height: 100px !important;' +
            '  width: 100px !important;' +
            '  vertical-align: top !important;' +  // for classic and plain themes
            '  color: #000 !important;' +
            '  font-weight: bolder !important;' +
            '  background: #fff url(' + narwhal() + ') no-repeat center !important;' +
            '  border: 1px solid #5c5c5c !important;' +
            '  text-shadow: 0 0 0.3em #fff, 0 0 0.3em #fff, 0 0 0.3em #fff, 0 0 0.3em #fff !important;' +
            '}' +
            'input#postButton:hover, input[value="Preview"]:hover, input.button[value="Preview"]:hover, input#previewButton:hover {' +
            '  background-position: center center !important;' +
            '  border: 1px solid #66afe9 !important;' +  // same as form-control:focus
            '  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset, 0 0 8px rgba(102, 175, 233, 0.6) !important;' +
            '}' +
            '#newcommentsmsg[style*="border: 1px solid white"] {' +
            '  background-image: url(' + laser() + ') !important;' +
            '  background-repeat: no-repeat !important;' +
            '  background-position: center bottom !important;' +
            '  padding-bottom: 170px !important;' +
            '}');

function unicorn() {
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}

function narwhal() {
    return 'data:image/jpg;base64,' +
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}

function laser() {
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}
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