How to change code block background color

currently, i am using the hello friend ng theme and I wants to change my code background color using css,
how can I do that?
current view

i want to change the background color of the code block from black to white,

By making a right click on the area, finding to class of the code area and changing that class to your preferred background color.

It might be:

.highlight pre {
background-color: green !important;

It might not work, because the theme has it’s styles included in the theme files instead of the stylesheet. The !important might help here.

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Thank you for response but i am not aware how !import work