<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style>
.slider-one-item:nth-child(n+2):nth-last-child(n+2) {
color: red;
}
</style>
</head>
<body>
<ul>
<li class="slider-one-item">Item 1</li>
<li class="slider-one-item">Item 2</li>
<li class="slider-one-item">Item 3</li>
<li class="slider-one-item">Item 4</li>
<li class="slider-one-item">Item 5</li>
<li class="slider-one-item">Item 6</li>
</ul>
</body>
</html>