Debut theme - CSS Code Has Caused Entire Website To Not Display

[Skarin584]

I was advised to input the following CSS:

Add this css at the bottom of
Online Store->Theme->Edit code->Assets->theme.css.liquid

@media screen and (max-width: 749px){
.slideshow__text-wrap--mobile {
    background-color: transparent;
    top: -3.2rem;
}
}

However in doing so, it has caused my entire website to not display. Only the menu, header and footer are displaying, nothing else.

Can anyone help please?