Natours project finished

Natours/starter/sass/abstracts/_mixins.scss

@@ -1,7 +1,14 @@
 @mixin clearfix {
-    &::after {
-        content: "";
-        display: table;
-        clear: both;
-    }
-}
+  &::after {
+    content: "";
+    display: table;
+    clear: both;
+  }
+}
+
+@mixin absCenter {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+}