fixed card-outline header border inside card-tabs

build/scss/_cards.scss

@@ -87,7 +87,7 @@
 
   &.card-tabs {
     &:not(.card-outline) {
-      & .card-header {
+      & > .card-header {
         border-bottom: 0;
 
         .nav-item {

dist/css/adminlte.css

@@ -17544,11 +17544,11 @@ textarea.form-control.is-warning {
   border-left: 1px solid rgba(0, 0, 0, 0.125);
 }
 
-.card.card-tabs:not(.card-outline) .card-header {
+.card.card-tabs:not(.card-outline) > .card-header {
   border-bottom: 0;
 }
 
-.card.card-tabs:not(.card-outline) .card-header .nav-item:first-child .nav-link {
+.card.card-tabs:not(.card-outline) > .card-header .nav-item:first-child .nav-link {
   margin-left: -1px;
 }