Quick build dark theme for the Evernote web client use something like Chrome [Stylebot](https://chrome.google.com/webstore/detail/stylebot/oiaejidbmkiecgbjeifoejpgmdaleoha?hl=en) to load this.

style.css

.GGAE30MDLFC, .GGAE30MDCCB, div#gwt-debug-NotesView-root, .GGAE30MDBTB, div#gwt-debug-MetaBarView-root, .GGAE30MDHIB {
    background-color: #444;
}

.GGAE30MDC3B, .GGAE30MDO1, div#gwt-debug-NoteView-root, .GGAE30MDDGB, div#gwt-debug-MetaBarView-root, .GGAE30MDHIB {
    background-color: #888;
}

.GGAE30MDERB, .GGAE30MDIQB, input#gwt-debug-NotebooksDrawer-drawerFilter-textBox, .GGAE30MDCCB, .GGAE30MDF1, .GGAE30MDFJB, .GGAE30MDHJB, .GGAE30MDJKB, .GGAE30MDHFB, .GGAE30MDF1B, .GGAE30MDAUB, .GGAE30MDAQ.GGAE30MDGQ .GGAE30MDFQ, .GGAE30MDLQ {
    border-color: #333 ;
}
.GGAE30MDDRB.GGAE30MDPRB,
.GGAE30MDH2B.GGAE30MDO1B {
    background: #555;
}

.GGAE30MDH2B {
    border-right: 1px solid #333;
}

.GGAE30MDL2B img {
    opacity: 0.4;
}

.GGAE30MDPQB, .GGAE30MDBQ {
    color: #eee;
}

.GGAE30MDAQ.GGAE30MDGQ .GGAE30MDFQ {
    border-width: 3px;
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
    -webkit-border-radius: 10px;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    -webkit-border-radius: 10px;
    background: #222;
}

::-webkit-scrollbar-thumb:window-inactive {
    background: #555;
}