How to use border radius in CSS

Border radius( usually we write border-radius ) is style attribute of css which uses for design the custom shapes using HTML element ( like div,span etc. ).

css syntax for border radius
border-radius: top-left corner radius , top-right corner radius , bottom-right corner radius , bottom-left corner radius ;

these all values we can gives in px(pixels), em(emphasize), %(percentages).
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