When using the light theme, the background color of the selected font may not be obvious. You can open settings.json by entering settings through the command panel (ctrl+shift+P)
{
"workbench.colorTheme": "Atom One Light",
"git.autofetch": true,
"explorer.confirmDelete": false,
"editor.tabSize": 2,
"workbench.colorCustomizations": {
"editor.selectionBackground": "#0d99a363"
}
}