The border-top-color changes the color of top border. You can try to run the following code to implement the border-top-color property:
Example
<html>
<head>
<style>
p.demo {
border:3px solid;
border-top-color:#FF0000;
}
</style>
</head>
<body>
<p class = "demo">
Example showing border top color property
</p>
</body>
</html>