A user style for hiding search bar in Google search pages.

google-no-search-bar.user.css

/* ==UserStyle==
@name        Google search bar hide
@description Hiding search bar in Google search pages.
@author      Hazem AbuMostafa (http://hazemam.com)
@homepageURL https://gist.github.com/HazemAM/7355fcdfb0e14d927da4ae9e6608fa14
@updateURL   https://gist.github.com/HazemAM/7355fcdfb0e14d927da4ae9e6608fa14/raw/google-no-search-bar.user.css
@namespace   github.com/hazemam
@version     1.1.0
@license     Apache-2.0

@preprocessor default
@var  number  height  "Header height"  [15, 5, null, 5, 'px']
==/UserStyle== */

@-moz-document regexp("http(s)?:\/\/(www\.)?google\.com(\.[a-z]+)?\/search.*") {
    /* THE BOX */

    .sfibbbc, .RNNXgb {
        display: none;
    }
    
    
    /* MINI LOGO */
    
    .minidiv .logo {
        padding-top: 8px;
        padding-bottom: 8px;
    }

    /*Mini bar background:*/
    .sfbg.nojsv {
        display: none;
    }


    /* MAIN POSITIONS */

    .srp #searchform {
        top: calc(5px + var(--height));
        height: 0;
    }

    #hdtb {
        margin-top: calc(-88px + (var(--height) * 2));
    }

    #hdtb-msb {
        margin-top: calc(-15px - var(--height));
    }


    /* TWEAKS */

    div.sfbg, div.sfbgg {
        min-width: 0;
        height: 0;
    }

    /*Background:*/
    .sfbgx {
        display: none;
    }

    /*Image tools:*/
    #ab_ctls {
        right: 180px;
        padding-top: calc(25px - var(--height));
    }

    /*Google top-right tools:*/
    .gb_Pf .gb_jb {
        /*margin-top: 3px;*/
    }


    /* COLORS AND POSITIONS */

    body.vasq #hdtb-msb .hdtb-mitem.hdtb-msel {
        line-height: 1;
        padding: 8px 15px;
        border-radius: 30px;
        height: 10px;
    }
    #hdtb-msb .hdtb-mitem.hdtb-msel {
        border-bottom: 3px solid #1A73E8;
        color: white;
        background-color: #1A73E8;
    }
    
    #hdtb-msb .hdtb-mitem.hdtb-msel img {
        filter: brightness(100);
    }

    /*Better click targets:*/
    #hdtb-msb .hdtb-mitem.hdtb-imb {
        height: calc(58px + var(--height));
        padding: 0;
    }
    #hdtb .hdtb-mitem a {
        display: inline-block;
        padding: 28px 16px;
        margin: 0;
    }
}