fix: remove margin-bottom from card

src/scss/_cards.scss

@@ -5,7 +5,6 @@
 // Color variants
 .card {
   @include box-shadow($lte-card-shadow);
-  margin-bottom: map-get($spacers, 3);
 
   &[class*="card-"]:not(.card-outline),
   &[class*="text-bg-"]:not(.card-outline) {