Code Logo for Mobile Device

How do I make my logo bigger for mobile device view? I've tried using the suggest codes others have provided to this same question but they do not work for me. My site is mvnrose.com and the template is Harris. Thanks! 

@mvnrose Add to Home > Design > Custom CSS

/* remove spacing around logo */
.mobile-branding-wrapper {
    padding: 0 !important;
}
/* set new logo width */
.mobile-branding-wrapper .mobile-logo-image a {
    max-width: 200px;
}