feat(CSS):remove border: black 1px solid; from .sliding-part CSS rule

Author: josueJURE

index.css

@@ -33,7 +33,7 @@ body {
   position: absolute;
   height: 530px;
   width: 400px;
-  border: black 1px solid;
+ 
   overflow: hidden;
   display: grid;
   grid-template-columns: repeat(4, 1fr);