Color and consistency over whitespace and waste

materialdesign2.css

/* Mail */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("mail.google.com") {
    .gb_Sa:not(.gb_Ta) .gb_Cd {
        padding: 0 !important;
    }
    .gb_Me {
        border-radius: 0 !important;
    }
    .G-atb, 
    .aKh, 
    .aKj, .J-KU-Jg-K9 .J-KU .aAy, .J-KU-Jg-K9 .J-KU .J-KU-KO .aAy,
    .Bn,
    .z0,
    .z0 > .L3 {
        box-shadow: none !important;
        height: 30px !important;
    }
    /* Title */
    .gb_8b {
        display: none !important;
    }
    #gb .gb_Cd.gb_9d.gb_Jd {
        background-color:#e75a4d !important;
    }
}
/* Notes */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("keep.google.com") {
    .gb_Sa:not(.gb_Ta) .gb_Cd {
        padding: 0 !important;
    }
    .gb_Me {
        border-radius: 0 !important;
    }
    /* Title */
    .gb_8b {
        display: none !important;
    }
}
/* Calendar */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("calendar.google.com") {
    .gb_Sa:not(.gb_Ta) .gb_Cd {
        padding: 0 !important;
    }
    .gb_Me {
        border-radius: 0 !important;
    }
    /* Title */
    .gb_8b {
        display: none !important;
    }
    #gb .gb_Cd.gb_9d {
        background-color: #4285f4 !important;
    }
}
/* Contacts */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("contacts.google.com") {
    .gb_Sa:not(.gb_Ta) .gb_Cd {
        padding: 0 !important;
    }
    .gb_Me {
        border-radius: 0 !important;
    }
    /* Title */
    .gb_8b {
        display: none !important;
    }
}
/* Drive */
@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("drive.google.com") {
    .gb_Sa:not(.gb_Ta) .gb_Cd {
        padding: 0 !important;
    }
    .gb_Me {
        border-radius: 0 !important;
    }
    /* Title */
    .gb_8b {
        /*display: none !important;*/
    }
    #gb .gb_Cd.gb_9d {
        background-color: #1fb96e !important;
    }
}