Improve Markdown Preview Code Block Coloring
Improve Markdown Preview Code Block Coloring

Fixes #7776

**Bug**
Code blocks in the markdown preview are not very good looking

**Fix**
Use default text color for indented code blocks and add a background

radshit/vscode,Microsoft/vscode,Zalastax/vscode,hungys/vscode,Zalastax/vscode,Krzysztof-Cieslak/vscode,radshit/vscode,cleidigh/vscode,radshit/vscode,hungys/vscode,matthewshirley/vscode,DustinCampbell/vscode,hoovercj/vscode,landonepps/vscode,microsoft/vscode,Zalastax/vscode,hashhar/vscode,gagangupt16/vscode,cleidigh/vscode,Zalastax/vscode,Microsoft/vscode,hungys/vscode,joaomoreno/vscode,mjbvz/vscode,hashhar/vscode,cleidigh/vscode,joaomoreno/vscode,stringham/vscode,DustinCampbell/vscode,gagangupt16/vscode,Krzysztof-Cieslak/vscode,cleidigh/vscode,microsoft/vscode,matthewshirley/vscode,Microsoft/vscode,joaomoreno/vscode,the-ress/vscode,matthewshirley/vscode,landonepps/vscode,matthewshirley/vscode,gagangupt16/vscode,cleidigh/vscode,rishii7/vscode,Krzysztof-Cieslak/vscode,hungys/vscode,hungys/vscode,hungys/vscode,microlv/vscode,matthewshirley/vscode,0xmohit/vscode,KattMingMing/vscode,gagangupt16/vscode,hashhar/vscode,Microsoft/vscode,rishii7/vscode,hungys/vscode,rishii7/vscode,veeramarni/vscode,matthewshirley/vscode,radshit/vscode,Zalastax/vscode,stringham/vscode,0xmohit/vscode,landonepps/vscode,the-ress/vscode,0xmohit/vscode,hoovercj/vscode,gagangupt16/vscode,radshit/vscode,Zalastax/vscode,Krzysztof-Cieslak/vscode,0xmohit/vscode,rishii7/vscode,veeramarni/vscode,joaomoreno/vscode,mjbvz/vscode,Krzysztof-Cieslak/vscode,radshit/vscode,hungys/vscode,Zalastax/vscode,hashhar/vscode,mjbvz/vscode,joaomoreno/vscode,rishii7/vscode,Zalastax/vscode,0xmohit/vscode,microlv/vscode,mjbvz/vscode,KattMingMing/vscode,the-ress/vscode,microlv/vscode,gagangupt16/vscode,matthewshirley/vscode,stringham/vscode,Microsoft/vscode,the-ress/vscode,hoovercj/vscode,hashhar/vscode,the-ress/vscode,radshit/vscode,0xmohit/vscode,matthewshirley/vscode,joaomoreno/vscode,landonepps/vscode,microlv/vscode,stringham/vscode,rishii7/vscode,0xmohit/vscode,hashhar/vscode,microsoft/vscode,microsoft/vscode,veeramarni/vscode,veeramarni/vscode,cleidigh/vscode,the-ress/vscode,hoovercj/vscode,0xmohit/vscode,stringham/vscode,Microsoft/vscode,landonepps/vscode,microsoft/vscode,Zalastax/vscode,microsoft/vscode,DustinCampbell/vscode,microsoft/vscode,eamodio/vscode,KattMingMing/vscode,stringham/vscode,KattMingMing/vscode,rishii7/vscode,0xmohit/vscode,eamodio/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,joaomoreno/vscode,veeramarni/vscode,radshit/vscode,gagangupt16/vscode,hoovercj/vscode,joaomoreno/vscode,the-ress/vscode,KattMingMing/vscode,mjbvz/vscode,veeramarni/vscode,hoovercj/vscode,radshit/vscode,Microsoft/vscode,DustinCampbell/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,landonepps/vscode,microsoft/vscode,eamodio/vscode,microsoft/vscode,DustinCampbell/vscode,Microsoft/vscode,mjbvz/vscode,Microsoft/vscode,gagangupt16/vscode,KattMingMing/vscode,stringham/vscode,rishii7/vscode,KattMingMing/vscode,Zalastax/vscode,hoovercj/vscode,landonepps/vscode,joaomoreno/vscode,matthewshirley/vscode,microsoft/vscode,0xmohit/vscode,eamodio/vscode,hoovercj/vscode,hoovercj/vscode,0xmohit/vscode,cleidigh/vscode,hoovercj/vscode,hoovercj/vscode,KattMingMing/vscode,DustinCampbell/vscode,microlv/vscode,hungys/vscode,joaomoreno/vscode,rishii7/vscode,hoovercj/vscode,landonepps/vscode,KattMingMing/vscode,hashhar/vscode,microlv/vscode,Microsoft/vscode,0xmohit/vscode,the-ress/vscode,eamodio/vscode,stringham/vscode,mjbvz/vscode,gagangupt16/vscode,gagangupt16/vscode,Krzysztof-Cieslak/vscode,radshit/vscode,mjbvz/vscode,eamodio/vscode,veeramarni/vscode,hoovercj/vscode,DustinCampbell/vscode,eamodio/vscode,cleidigh/vscode,DustinCampbell/vscode,0xmohit/vscode,hungys/vscode,Krzysztof-Cieslak/vscode,microsoft/vscode,the-ress/vscode,matthewshirley/vscode,rishii7/vscode,eamodio/vscode,matthewshirley/vscode,rishii7/vscode,joaomoreno/vscode,cleidigh/vscode,cleidigh/vscode,microlv/vscode,DustinCampbell/vscode,veeramarni/vscode,microlv/vscode,stringham/vscode,hungys/vscode,hashhar/vscode,hashhar/vscode,stringham/vscode,KattMingMing/vscode,hashhar/vscode,microsoft/vscode,eamodio/vscode,radshit/vscode,DustinCampbell/vscode,rishii7/vscode,radshit/vscode,eamodio/vscode,microlv/vscode,Krzysztof-Cieslak/vscode,veeramarni/vscode,veeramarni/vscode,cleidigh/vscode,hoovercj/vscode,landonepps/vscode,gagangupt16/vscode,eamodio/vscode,matthewshirley/vscode,gagangupt16/vscode,rishii7/vscode,stringham/vscode,Zalastax/vscode,microsoft/vscode,the-ress/vscode,hungys/vscode,hungys/vscode,cleidigh/vscode,rishii7/vscode,veeramarni/vscode,gagangupt16/vscode,Krzysztof-Cieslak/vscode,mjbvz/vscode,the-ress/vscode,hashhar/vscode,microlv/vscode,KattMingMing/vscode,Krzysztof-Cieslak/vscode,Krzysztof-Cieslak/vscode,landonepps/vscode,the-ress/vscode,rishii7/vscode,joaomoreno/vscode,matthewshirley/vscode,gagangupt16/vscode,hashhar/vscode,KattMingMing/vscode,microlv/vscode,joaomoreno/vscode,eamodio/vscode,0xmohit/vscode,hashhar/vscode,cra0zy/VSCode,Zalastax/vscode,hashhar/vscode,Zalastax/vscode,eamodio/vscode,matthewshirley/vscode,mjbvz/vscode,0xmohit/vscode,Microsoft/vscode,microlv/vscode,Microsoft/vscode,veeramarni/vscode,Microsoft/vscode,matthewshirley/vscode,cleidigh/vscode,mjbvz/vscode,landonepps/vscode,cleidigh/vscode,stringham/vscode,mjbvz/vscode,radshit/vscode,DustinCampbell/vscode,veeramarni/vscode,joaomoreno/vscode,the-ress/vscode,mjbvz/vscode,eamodio/vscode,0xmohit/vscode,hoovercj/vscode,rishii7/vscode,radshit/vscode,landonepps/vscode,DustinCampbell/vscode,eamodio/vscode,gagangupt16/vscode,veeramarni/vscode,hoovercj/vscode,DustinCampbell/vscode,KattMingMing/vscode,radshit/vscode,Zalastax/vscode,gagangupt16/vscode,eamodio/vscode,Microsoft/vscode,Microsoft/vscode,landonepps/vscode,DustinCampbell/vscode,Zalastax/vscode,the-ress/vscode,KattMingMing/vscode,DustinCampbell/vscode,KattMingMing/vscode,Microsoft/vscode,microlv/vscode,landonepps/vscode,hungys/vscode,Krzysztof-Cieslak/vscode,eamodio/vscode,stringham/vscode,landonepps/vscode,KattMingMing/vscode,cleidigh/vscode,the-ress/vscode,microlv/vscode,the-ress/vscode,matthewshirley/vscode,radshit/vscode,Zalastax/vscode,microlv/vscode,0xmohit/vscode,Zalastax/vscode,stringham/vscode,microsoft/vscode,hungys/vscode,microsoft/vscode,cleidigh/vscode,hungys/vscode,hashhar/vscode,hashhar/vscode,matthewshirley/vscode,stringham/vscode,hungys/vscode,microsoft/vscode,microlv/vscode,mjbvz/vscode,veeramarni/vscode,hashhar/vscode,rishii7/vscode,stringham/vscode,landonepps/vscode,joaomoreno/vscode,stringham/vscode,Krzysztof-Cieslak/vscode,gagangupt16/vscode,landonepps/vscode,Krzysztof-Cieslak/vscode,mjbvz/vscode,radshit/vscode,mjbvz/vscode,microlv/vscode,veeramarni/vscode,DustinCampbell/vscode,cleidigh/vscode,mjbvz/vscode,joaomoreno/vscode,DustinCampbell/vscode,KattMingMing/vscode,joaomoreno/vscode,Microsoft/vscode,veeramarni/vscode,hoovercj/vscode