watchtower/docs/stylesheets/theme.css

[data-md-color-scheme="containrrr"] {
    --md-primary-fg-color: #406170;
    --md-primary-fg-color--light:#acbfc7;
    --md-primary-fg-color--dark: #003343;
    --md-accent-fg-color: #003343;
    --md-accent-fg-color--transparent: #00334310;
}

[data-md-color-scheme="slate"] {
    --md-typeset-a-color: #7f9ece;
}

.md-header-nav__button.md-logo {
    padding: 0;
}

.md-header-nav__button.md-logo img {
    width: 1.6rem;
    height: 1.6rem;
}