Add box-shadow to blue buttons in normal theme (#9573)

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: techknowlogick <matti@mdranta.net>

web_src/less/_base.less

@@ -1172,3 +1172,9 @@ i.icon.centerlock {
 .octicon-tiny {
     font-size: 0.85714286rem;
 }
+
+.ui.basic.blue.button,
+.ui.basic.blue.buttons .button {
+    box-shadow: inset 0 0 0 1px #1678c2 !important;
+    color: #1678c2 !important;
+}