I modified my CSS to:
.nav-gif-wrapper:hover, .nav-gif-wrapper:focus, .nav-gif-wrapper:active {
text-decoration: line-through 3px;
}
Still don't see anything on my iphone 8, chrome browser—when I hold my finger on the heading it opens a menu native to chrome, no visible effects. The interesting thing is the very bottom "This is the end." link maintains its desktop hover effect in my mobile browser. Both code blocks.