Deregister Plugin CSS in WordPress

add_action( 'wp_print_styles', 'my_deregister_styles', 100 );

function my_deregister_styles() {
	if(!is_single()) {
	wp_deregister_style( 'plugin_name' ); }
}
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Using hover function in Jquery

I have learned how to use a hover function in jquery.

<script type="text/javascript">
$(document).ready(function(){
$('Id or class name of a div').hover(function(){
$('Id or class name of a div(same name)').css('opacity','1');
},function(){
$('Id or class name of a div(samename)').css('opacity','0');
});
});
</script>