removed transparency from tooltips

src/styles.scss

@@ -311,6 +311,10 @@ input[type="checkbox"]:checked::after {
   }
 }
 
+.tooltip.show {
+  opacity: 1;
+}
+
 // Used to remove the empty space under form fields
 .mat-mdc-form-field-subscript-wrapper {
   display: none;