Code block for mobile only

I created a vertical line to use as a divider on a website I am building. The only way I could do it was with custom css and html. However it doesn't work for the mobile version of the website. Is there a way to hide this block of code for the mobile site? Thanks in advance. I can provide my source code if that helps. 

Hi, can't check without a link to your website or more details, but try the below. This will not show the selected element. You will need to replace with your block selector.

@media only screen and (max-width:640px) {
	your_line_block_reference {
		display: none!important;
	}
}