userContent.css

* {
    --color1: #131a1c;
    --color3: #22292b;
    --color5: #67b0e8;
    --color6: #bab3e5;

  scrollbar-width: thin !important;
    scrollbar-color: var(--color3) var(--color1) !important;
}

@-moz-document url("about:privatebrowsing"){
    html:not(#ublock0-epicker), html:not(#ublock0-epicker) body, #newtab-customize-overlay {
        background-color: var(--color1) !important;
    }
    #search-handoff-button {
        background-color: #181f21 !important;
        border: none !important
        box-shadow: none !important;
        border-bottom: 1px solid var(--color5) !important;
        border-radius: 10px 10px 10px 10px !important;
    }

    .fake-caret {background: rgb(255, 255, 255) !important;}
    .logo-and-wordmark .wordmark {
        fill: var(--color5) !important;

    }
}

  @-moz-document url("about:home"),url("about:blank"),url("about:newtab"){
    html:not(#ublock0-epicker), html:not(#ublock0-epicker) body, #newtab-customize-overlay {
        background-color: var(--color1) !important;
    }

    .search-wrapper .search-handoff-button {
        background-color: #181f21 !important;
        color: var(--color6) !important;
        border: none !important;
        box-shadow: none !important;
        border-bottom: 1px solid var(--color1) !important;
        border-radius: 10px 10px 10px 10px !important;
      }
    .search-wrapper .logo-and-wordmark {
        opacity: 0.8 !important;
    }

    .search-wrapper input:focus {
        background-color: #232a2d !important;
    color: white !important;
    }
    .search-wrapper .search-button {
        fill: #8ccf7e !important;
    }
    .search-wrapper .search-button:focus,
    .search-wrapper .search-button:hover {
        background-color: #232a2d !important;
        fill: white !important;
    }
    .outer-wrapper.newtab-experience .search-wrapper .search-handoff-button .fake-caret {
        top: 12px !important;
    }

    .outer-wrapper.newtab-experience .search-wrapper .search-inner-wrapper {
        min-height: 42px !important;
    }
}