message: tidy up hamburger menu styling
diff: left: 0;
  right: 0;
  height: 100%;
  + z-index: 10;
  display: flex;
  flex-direction: column;
  color: var(--boxel-light);
  justify-content: space-between;
  align-items: center;
  flex-basis: auto;
  - padding: var(--boxel-sp-lg) var(--boxel-sp);
  + padding: var(--boxel-sp) var(--boxel-sp);
  }
  .hamburger-menu__list {
  