feat(css): add margin to subsequent primary buttons in cards

Introduces a margin-top rule for primary buttons within `.card-body`, specifically targeting all but the first button. This change ensures consistent spacing between stacked buttons, enhancing the visual layout and overall user interface within card components. The adjustment caters to the need for clearer visual separation in dense UI areas, particularly where multiple actions are presented in a confined space.

assets/css/base.css

@@ -81,6 +81,10 @@ h5 {
   font-size: x-large;
 }
 
+.card-body .btn-primary:not(:first-child) {
+  margin-top: 10px;
+}
+
 /* Responsive Styles */
 @media (max-width: 768px) {
   .navbar .container {