/* Cacher le formulaire login classique */
.login-form .form-login-fields,
.login-form input[type="text"],
.login-form input[type="password"],
.login-form .submit-button,
form[name="loginForm"],
.login-content > form,
[ng-controller*="Login"] form {
    display: none !important;
}


/* Cacher tout le formulaire login classique et son bouton */
form.login-form {
    display: none !important;
}
/* Cacher l'ancien logo SVG */
div.logo-svg {
    display: none !important;
}

/* Cacher le slogan */
h2.tagline {
    display: none !important;
}

/* Remplacer le h1 par le logo Cyber-Lab */
h1.logo {
    background-image: url('/v-1771453196038/images/cyberlab-logo.png') !important;
    background-repeat: no-repeat !important;
    background-size: contain !important;
    background-position: center !important;
    width: 200px !important;
    height: 200px !important;
    display: block !important;
    margin: 0 auto !important;
    font-size: 0 !important;
    color: transparent !important;
}

h1.logo img,
h1.logo svg,
h1.logo tg-svg,
h1.logo span,
h1.logo > * {
    display: none !important;
}
Vide le cache et recharge.