WhisperCom/docs/doxygen-awesome-css/docs/doxygen-custom/custom.css

.github-corner svg {
    fill: var(--primary-light-color);
    color: var(--page-background-color);
    width: 72px;
    height: 72px;
}

@media screen and (max-width: 767px) {
    .github-corner svg {
        width: 55px;
        height: 55px;
    }
    #projectnumber {
        margin-right: 22px;
    }
}