Hi,
---------------abc.css-----------
.myclass {
text-decoration: overline;
border-right: blue thin solid;
border-top: blue thin solid;
display: block;
visibility: visible;
border-left: blue thin solid;
border-bottom: blue thin solid;
}
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modify above code for your use, if required.
the best way to apply the css is: use the Visual Studio, select a html file, drag n drop a <div> or <span> then go to the properties window, select the style and try there.
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Mark as Answer if u got. Happy Coding.