/* This makes the logo larger and adds a bit of breathing room */
.md-header__button.md-logo img {
    height: 3rem;   /* Standard is about 1.2rem. Increase this to your liking */
    width: auto;
}

/* Optional: This adjusts the header height if the logo is too big for the bar */
.md-header {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}