.md-header {
  height: calc(3.2rem + 15px);  /* <-- Increase the total height */
  padding-top: 15px;           /* <-- Use padding-top instead of margin-top */
}
.md-header__button.md-logo,
.md-header-nav {
  line-height: 3.2rem;
}
.md-header__button.md-logo {
  margin: 0;
  padding: 0;
  margin-top: 2px;    /* 只留小间距，保证logo和菜单都在同一条线上 */
}
.md-header__button.md-logo img,
.md-header__button.md-logo svg {
  height: 3.0rem;
  width: 3.0rem;
}

.md-sidebar--primary {
  width: 160px;   /* this is the width for navigation bar, usual width is: 260px or 300px */
}
.md-grid {
  max-width: 1500px;  /* this can control the whole width of the window */
}