How do I hide my site tagline but keep my website title

Please provide a link to a page on your site where we can see this. Thanks.

I have the same problem. Can you help me out?
My site: https://mithich.com/

@vodinhung25

.site-description{
    left: -9999px;
    top: -9999px;
    position: fixed;
}

To add CSS: If you are using WordPress 4.7, use the “Custom CSS” option in the customizer. If your theme has a custom CSS option, use that to add the CSS shown above. If not, install the plugin Simple Custom CSS. Or, if you have Jetpack installed, enable its Custom CSS module.

Learn to use the Chrome Developer Tools to help you see and test changes to your CSS.