adjust modal styles

src/client/styles/scss/_override-bootstrap-variables.scss

@@ -71,4 +71,11 @@ $navbar-nav-link-padding-x:       1rem;
 
 
 // Dropdowns
-$dropdown-border-radius:          0;
+$dropdown-border-radius:          0;
+
+
+// Modals
+$modal-content-border-width:      0;
+$modal-content-border-radius:     0;
+$modal-header-padding-y:          0.75rem;
+$modal-header-padding-x:          1rem;

src/client/styles/scss/_override-bootstrap.scss

@@ -37,9 +37,14 @@
   }
 }
 
-// Dropdowns {
+// Dropdowns
 .dropdown {
   .dropdown-toggle.btn.disabled {
     cursor: not-allowed;
   }
 }
+
+//Modals
+.modal-content {
+  box-shadow: 0 0.3rem 1rem rgba(0, 0, 0, 0.1);
+}