Button with only one round corner

try putting !important next to the property

 

If this is for the Divi Button module, the CSS class actually gets set on the "a" tag itself, so use this instead:

Code:

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If it still doesn't work, try combining this with the !important property suggested by fasih.

 

Note that you can also apply the same border radius effect entirely within the Button module settings, which can be useful for keeping the button and its styles together in one place. Details here:

https://divibooster.com/making-one-corner-of-a-divi-button-module-round/