willfan09 on "Expound: Hide Site Title and Tagline on Tablet"

Using Expound theme and have combed pretty much every thread I could find to hide my site title and tagline on tablet. I have child theme and have hidden title and tag on desktop effectively using the below code (which also includes code for making header image clickable).

.site-title a {
    background: url('http://url-to-your-logo.png') 0 0 no-repeat;
    width: 800px;
    height: 120px;
    text-indent: -9999px;
}

I have an Ipad and Ipad mini and both refuse to hide the site title and tagline. I have tried many versions of the below but none have worked.

.site-title,
.site-description{
    visibility: hidden;
}

.site-title,
.site-description{
    display: none;
}

I would just uncheck the "display header text" box of the site title and tagline but after reading tons of threads it seems this is a terrible idea as far as SEO. Anything I can do to resolve this? My site is http://www.veggiefans.net