anybody know how to change jupyter notebook code cells to bold like this?

because now i have not standart jupyter font size and don't know why
now i have font like this
anybody know how to change jupyter notebook code cells to bold like this?

because now i have not standart jupyter font size and don't know why
now i have font like this
The content of the notebook is styled using CSS. If you want to customise it then you need to create a custom style sheet.
Create a custom folder in the Jupyter profile folder, usually ~/.jupyter/custom/.
Within this folder create a custom.css file and add your custom CSS to it.
.code_cell {
font-weight: bold;
}
Changes should take effect the next time you open Jupyter Notebook.