css - How to insert character in firefox style editor? -

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e.g. have such css code edit on fly: 

nav {     margin: 100px auto;      text-align: center; }

it seems way edit through firefox's inspect element high light part , overwrite it.

every time when try move cursor somewhere, delete characters , add new (for example, move position between 2 zeros, delete first 1 , add 5 such 100 changes 150), automatically brings characters have deleted. see below: 

nav {     margin: 1050px auto;      text-align: center; }

the deleted 0 automatically goes back. turns out super annoying me couldn't around issue @ all. can tell me how edit style way same people in text editor instead of bringing have deleted, making edition totally messed up.


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