[data-md-color-primary="lightblue"] {
  --md-primary-fg-color: #3d93ce; 
  --md-primary-bg-color: #ffffff; 
}
.md-nav__item--section > .md-nav > .md-nav__list {
    margin-left: 0.5rem;
    padding-left: 1rem;
}
.md-header__button.md-logo img,
.md-header__button.md-logo svg {
  height: 3rem;   /* or try 3rem, 48px, etc. */
  width: auto;
  margin: 0;
  padding: 0;
}

.md-header, 
.md-header .md-header__title,
.md-header .md-header-nav__title,
.md-header .md-header-nav__button {
  color: #162d50 !important;  /* dark blue */
}