CSS changes not being used

Questions
1

I went into my CSS 2 days ago and saw the external links.  I just now went in and they were gone.  I was able to add the 3 external links. again.   I have changed css inline code from

.nx-basicfieldeditor-item {padding: 0 8px;
border-bottom: 10px solid #ffffff;
background-color: transparent;
}

to

.nx-basicfieldeditor-item {padding: 0 25px;
border-bottom: 10px solid #ffffff;
background-color: transparent;
}

But when I inspect in code it shows the original  

.nx-basicfieldeditor-item {padding: 0 8px;

2

It may browser cache problem. Clear the browser cache and try again

3

That fixed it.