Basic.css/css/theme/light-aquamarine.css

:root{
    --c1:#00ebc7;
    --c2:#f2f4f6;
    --c3:#fff;
    --c4:#1b2d45;
    --c5:#fff;
    }

    blockquote {border-left: 5px solid var(--c1)}
    thead,tfoot {background: var(--c1)}