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// Add Button link shortcode
function button_func( $atts ) {
    $a = shortcode_atts( array(
        'linkname' => 'Click here',
        'link' => 'Add link',
				'color' => 'Button Color',
    ), $atts );

    return ' <a class="button ' . "{$a['color']}" .'btn" href="' . "{$a['link']}" .'">'."{$a['linkname']}".'</a>';
}
add_shortcode( 'button', 'button_func' );

// Use Like So: [button link="#" linkname="students" color="yellow"]
// Renders: <a class="button yellowbtn" href="#">students</a>