:root {
  --md-primary-fg-color:        #155e84;
  --md-primary-fg-color--light: #3890b3;
  --md-primary-fg-color--dark:  #0b4c6a;
}

.md-header__button.md-logo img {
	height: 50px !important; /* adjust as needed */
	width: auto;
}