diff --git a/BTCPayServer/wwwroot/main/css/site.css b/BTCPayServer/wwwroot/main/css/site.css
index d459951e3..8663af490 100644
--- a/BTCPayServer/wwwroot/main/css/site.css
+++ b/BTCPayServer/wwwroot/main/css/site.css
@@ -1,5 +1,4 @@
-
-/* Wrapping element */
+/* Wrapping element */
 /* Set some basic padding to keep content from hitting the edges */
 .body-content {
     padding-left: 15px;
@@ -43,71 +42,3 @@ footer {
     width: 100%;
     overflow: hidden;
 }
-
-/* preserving bootstrap3 btn-default now that we migrated to bootstrap4 */
-
-
-.btn-default {
-    color: #333;
-    background-color: #fff;
-    border-color: #ccc;
-}
-
-    .btn-default:focus,
-    .btn-default.focus {
-        color: #333;
-        background-color: #e6e6e6;
-        border-color: #8c8c8c;
-    }
-
-    .btn-default:hover {
-        color: #333;
-        background-color: #e6e6e6;
-        border-color: #adadad;
-    }
-
-    .btn-default:active,
-    .btn-default.active,
-    .open > .dropdown-toggle.btn-default {
-        color: #333;
-        background-color: #e6e6e6;
-        border-color: #adadad;
-    }
-
-        .btn-default:active:hover,
-        .btn-default.active:hover,
-        .open > .dropdown-toggle.btn-default:hover,
-        .btn-default:active:focus,
-        .btn-default.active:focus,
-        .open > .dropdown-toggle.btn-default:focus,
-        .btn-default:active.focus,
-        .btn-default.active.focus,
-        .open > .dropdown-toggle.btn-default.focus {
-            color: #333;
-            background-color: #d4d4d4;
-            border-color: #8c8c8c;
-        }
-
-    .btn-default:active,
-    .btn-default.active,
-    .open > .dropdown-toggle.btn-default {
-        background-image: none;
-    }
-
-    .btn-default.disabled:hover,
-    .btn-default[disabled]:hover,
-    fieldset[disabled] .btn-default:hover,
-    .btn-default.disabled:focus,
-    .btn-default[disabled]:focus,
-    fieldset[disabled] .btn-default:focus,
-    .btn-default.disabled.focus,
-    .btn-default[disabled].focus,
-    fieldset[disabled] .btn-default.focus {
-        background-color: #fff;
-        border-color: #ccc;
-    }
-
-    .btn-default .badge {
-        color: #fff;
-        background-color: #333;
-    }