If you are having problems getting your browser to update CSS on your web page then this post will definitely help you. There are mainly two different methods I will be showing you.
Method 1 - Clearing Cache
If you press F12, you now be able to right click on the refresh button and click the last option which is Empty Cache & Hard Reload.
Alternatively you can press Control + Shift + R.
Method 2 - Query Strings
This method is barely used by me because normally the first method works. Only if the top method fails I will decide to do this.
This requires adding something which is known as a Query String to the end of the filename you used to link your style sheet.
When you are done it should look something like this:
<link rel="stylesheet" href="styles.css?v=1"/>
Every time you have a problem with your CSS not updating you can just update the number or change it to something random and your browser will be forced to update your CSS.