:root {
  --top-icon-size:38px;
  --top-icon-font:1.05rem;
}

.nav a.nav-icon,
.nav button.nav-icon,
.logout-button {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:var(--top-icon-size);
  min-width:var(--top-icon-size);
  min-height:var(--top-icon-size);
  padding:0;
  font-size:var(--top-icon-font);
  font-weight:800;
  line-height:1;
  letter-spacing:0;
}

.logout-button {
  width:var(--top-icon-size);
  min-width:var(--top-icon-size);
}

.nav a.nav-icon {
  text-align:center;
}