-webkit-file-upload-button css stye code example
Example 1: connext html file to css
<link rel="stylesheet" type="text/css" href="style.css">
Example 2: how to link css to html
<link rel="stylesheet" href="PathToYourFile.css">
<link rel="stylesheet" type="text/css" href="style.css">
<link rel="stylesheet" href="PathToYourFile.css">