stuff.css

#status-indicators,
#status-indicators div:not(#status-inspection),
#status-info,
#status-indicators {
    background: transparent;
    color: inherit;
}
.CodeMirror-activeline-background {
    background: none;
}
#working-set-header {
    text-shadow: none;
}
.sidebar-selection-extension, .filetree-selection-extension { /* weird extension of the selected filename - disable styling so we can style by using .sidebar-selection and won't have to target these as well */
    background: transparent;
    border: none;
}
.working-set-header, .working-set-header>span {
    background: transparent;
}
.inline-widget .CodeMirror-scroll .CodeMirror-linenumbers {
    background-color: transparent;
}