Line and column highlight colours amended after review for different themes.

src/vs/workbench/parts/debug/browser/media/current-and-breakpoint.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g><g transform="translate(1 3)"><path d="M9.188 0H4.375C1.96 0 0 2.24 0 5s1.96 5 4.375 5h5.25L15 5 9.625 0h-.438z" stroke-opacity=".2" stroke="#000" fill="#FFFFA6"/><circle fill="#E51400" cx="5" cy="5" r="3"/></g></g></g></svg>
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+<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g><g transform="translate(1 3)"><path d="M9.188 0H4.375C1.96 0 0 2.24 0 5s1.96 5 4.375 5h5.25L15 5 9.625 0h-.438z" stroke-opacity=".2" stroke="#000" fill="#FFFF82"/><circle fill="#E51400" cx="5" cy="5" r="3"/></g></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/current-arrow.svg

-<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke-opacity=".2" stroke="#000" fill="#FFFFA6"><g><path d="M10.188 3H5.375C2.96 3 1 5.24 1 8s1.96 5 4.375 5h5.25L16 8l-5.375-5h-.438z"/></g></g></g></svg>
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+<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g stroke-opacity=".2" stroke="#000" fill="#FFFF82"><g><path d="M10.188 3H5.375C2.96 3 1 5.24 1 8s1.96 5 4.375 5h5.25L16 8l-5.375-5h-.438z"/></g></g></g></svg>
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src/vs/workbench/parts/debug/browser/media/debug.contribution.css

@@ -9,7 +9,7 @@
 }
 
 .monaco-editor .debug-top-stack-frame-line {
-	background: rgba(255, 255, 0, 0.35);
+	background: rgba(255, 255, 102, 0.25);
 }
 
 .monaco-editor .debug-top-stack-frame-exception-line {
@@ -17,7 +17,7 @@
 }
 
 .monaco-editor .debug-top-stack-frame-column {
-	background: rgba(255, 200, 0, 0.7);
+	background: rgba(255, 255, 102, 0.75);
 }
 
 .monaco-editor .debug-focused-stack-frame-line {
@@ -181,7 +181,7 @@
 }
 
 .monaco-editor.vs-dark .debug-top-stack-frame-line {
-	background: rgba(255, 255, 0, 0.20);
+	background: rgba(255, 255, 0, 0.15)
 }
 
 .monaco-editor.vs-dark .debug-top-stack-frame-exception-line {
@@ -189,7 +189,7 @@
 }
 
 .monaco-editor.vs-dark .debug-top-stack-frame-column {
-	background: rgba(255, 255, 0, 0.15);
+	background: rgba(255, 255, 0, 0.25)
 }
 
 .monaco-editor.vs-dark .debug-breakpoint-glyph,
@@ -242,10 +242,11 @@
 }
 
 .hc-black .monaco-editor .debug-top-stack-frame-line {
-	background: rgba(255, 246, 0, .87);
+	background: rgba(255, 255, 0, .87);
 	mix-blend-mode: lighten; /* Preserves text selection's contrast */
 }
 
 .hc-black .monaco-editor .debug-top-stack-frame-column {
-	outline: 2px solid #ff0000;
-}
\ No newline at end of file
+	background: none;
+	outline: 2px solid #f38518;
+}