Fixes for Github's design mistakes.

Github.user.css

/* ==UserStyle==
@name         Github Enhancements
@namespace    com.zero-factorial.userstyles
@homepageURL  https://gist.github.com/Deledrius/0ec75b8081e0a9229fcf70ad4a0acbb1
@updateURL    https://gist.github.com/Deledrius/0ec75b8081e0a9229fcf70ad4a0acbb1/raw/Github.user.css
@version      1.0.2
@license      MIT
@description  Fixes design mistakes on Github.
@author       Joseph Davies
==/UserStyle== */

@-moz-document domain("github.com"), domain("gist.github.com") {
    body,
    .intgrs-page .main-content,
    .blog-content,
    .migration-wrapper,
    .migrate-owners-wrapper,
    .setup-wrapper,
    .showcase-page-title,
    .tooltipped::after
    {
        font-family: Helvetica, arial, nimbussansl, liberationsans, freesans, clean, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !important;
    }

    .markdown-body
    {
        font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, freesans, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !important;
    }

    body
    {
        font-size: 13px !important;
        line-height: 1.4 !important;
    }
    
    /* Dark Header Fix */
    .Header, .HeaderNavlink, .Header-link {
        background-color: #eee !important;
        color: #555 !important;
    }
    .header-search-scope, .header-search-wrapper, .header-search-input {
        background-color: #fff !important;
        color: #333 !important;
    }
    .header-search-scope {
        color: #767676 !important;
        background-color: #E8E8E8 !important;
        border: 1px solid #fff !important;
        border-radius: 3px;
    }
    .header-search-wrapper {
        border: 1px solid #ddd !important;
        box-shadow: inset 0 1px 2px rgba(0,0,0,0.075) !important;
    }
    .octicon {
       color: #444 !important;
    }
    *::placeholder {
       color: rgba(0,0,0,0.4) !important;
    }
}