fix: removeed unused css (VapiAI#239)

Co-authored-by: Kapil Gowru <[email protected]>

Author: fern-support

fern/assets/styles.css

@@ -155,20 +155,3 @@
 .fern-theme-default.fern-container .fern-sidebar-container {
   background-color: light-dark(#fffaea, #0e0e13);
 }
-
-/* BUTTONS */
-.fern-button:not([disabled]).filled.primary {
-  background-color: light-dark(#09090b, #fffaea);
-}
-
-.fern-button.filled.primary .fern-button-text {
-  color: light-dark(#ffffff, #09090b);
-}
-
-.fern-button.filled.primary:not([disabled]) .fa-icon {
-  background-color: light-dark(#ffffff, #09090b);
-}
-
-.fern-button:not([disabled]).filled.primary:hover {
-  background-color: light-dark(#09090b, #fffaea);
-}