fix(client): better contrast for code sections when selected (#40461)

Co-authored-by: Ahmad Abdolsaheb <ahmad.abdolsaheb@gmail.com>

client/src/components/layouts/global.css

@@ -68,6 +68,10 @@ p {
   overflow-wrap: break-word;
 }
 
+::selection {
+  background-color: rgba(var(--highlight-color), 0.3);
+}
+
 @media (max-width: 500px) {
   .big-heading {
     font-size: 1.5rem !important;
@@ -459,7 +463,7 @@ pre {
 .has-success.checkbox label,
 .has-success.radio-inline label,
 .has-success.checkbox-inline label {
-  color: var(--highlight-color);
+  color: rgb(var(--highlight-color));
 }
 
 .has-error .help-block,

client/src/components/layouts/variables.css

@@ -14,8 +14,8 @@
   --purple-dark: #5a01a7;
   --yellow-light: #ffc300;
   --yellow-dark: #4d3800;
-  --blue-light: #99c9ff;
-  --blue-dark: #002ead;
+  --blue-light: 153, 201, 255;
+  --blue-dark: 0, 46, 173;
   --green-light: #acd157;
   --blue-mid: #198eee;
   --purple-mid: darkviolet;

client/src/templates/Challenges/classic/classic.css

@@ -3,7 +3,7 @@
 }
 
 .monaco-menu .action-label {
-  color: var(--highlight-color);
+  color: rgb(var(--highlight-color));
   letter-spacing: 0.02em;
 }
 

client/src/templates/Challenges/components/challenge-description.css

@@ -16,3 +16,7 @@
 #instructions ol {
   font-family: 'Lato', sans-serif;
 }
+
+#description ::selection {
+  background-color: rgba(var(--highlight-color), 0.3);
+}