h1.site-title a,
p.site-title a {
    display: inline-block;
    width: 220px;
    height: 50px;
    background: url(images/logo-graines-des-paix-academy.png) no-repeat center center;
    background-size: contain;
    text-indent: -5000px;
}

@media only screen and (min-width: 992px) {

    h1.site-title a,
    p.site-title a {
        width: 380px;
        height: 90px;
    }
}