Skip tab spacing and show incorrect spaces and return characters

client/src/components/Code/index.css

@@ -4,7 +4,7 @@
   letter-spacing: 0.12rem;
 }
 
-.pending {
+.pending, .space {
   color: gray;
 }
 
@@ -21,6 +21,14 @@
   color: red;
 }
 
+.incorrect-space {
+  border-bottom: 1px solid red;
+}
+
+.incorrect-enter {
+  border-left: 1px solid red;
+}
+
 @keyframes blink {
   0% {
     border-left: 1px solid white;