diff --git a/src/gui/src/UI/UIWindowSignup.js b/src/gui/src/UI/UIWindowSignup.js
index 9de2dc3be..2e65d6e03 100644
--- a/src/gui/src/UI/UIWindowSignup.js
+++ b/src/gui/src/UI/UIWindowSignup.js
@@ -113,7 +113,7 @@ function UIWindowSignup(options) {
         h += '</div>';
         // "Sign up with email" button, shown only when OIDC providers are available
         h += `<div class="signup-with-email-wrapper" style="display:none;">`;
-        h += `<button class="signup-with-email-btn button button-block button-normal">${i18n('sign_up_with_email')}</button>`;
+        h += `<button class="signup-with-email-btn oidc-btn button button-block button-normal">${i18n('sign_up_with_email')}</button>`;
         h += `</div>`;
         // terms and privacy
         h += `<p class="signup-terms">${i18n('tos_fineprint', [], false)}</p>`;
diff --git a/src/gui/src/css/style.css b/src/gui/src/css/style.css
index 2489034ee..68cff0a16 100644
--- a/src/gui/src/css/style.css
+++ b/src/gui/src/css/style.css
@@ -2126,7 +2126,7 @@ label {
 .oidc-btn {
     font-size: 14px;
     color: #393939;
-    background-color: transparent;
+    background: transparent;
 }
 
 .error {