a[href^="https://juliamanifolds.github.io/Manifolds.jl/"]::before {
    content: "";
    background-image: url('logo-manifolds.png');
    background-size: contain;
    background-repeat: no-repeat;
    display: inline-block;
    height: 1em;
    width: 1em;
    margin-right: 4px;
    vertical-align: middle;
}

a[href^="https://manoptjl.org/"]::before {
    content: "";
    background-image: url('logo-manopt.png');
    background-size: contain;
    background-repeat: no-repeat;
    display: inline-block;
    height: 1em;
    width: 1em;
    margin-right: 4px;
    vertical-align: middle;
}

a[href^="https://en.wikipedia.org/"]::before {
    content: "";
    background-image: url('wikipedia.png');
    background-size: contain;
    background-repeat: no-repeat;
    display: inline-block;
    height: 1em;
    width: 1em;
    margin-right: 4px;
    vertical-align: middle;
}

@media (prefers-color-scheme: dark) {
    a[href^="https://juliamanifolds.github.io/Manifolds.jl/"]::before {
        background-image: url('logo-manifolds-dark.png');
    }
}