jellyfin/Jellyfin.Server/wwwroot/api-docs/swagger/custom.css

/* logo */
.topbar-wrapper img[alt="Swagger UI"], .topbar-wrapper span {
    visibility: collapse;
}

.topbar-wrapper .link:after {
    content: url(../banner-dark.svg);
    display: block;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    max-width: 100%;
    max-height: 100%;
    width: 150px;
}
/* end logo */