header {
  width: 100vw; /* ensures that the header always fills the browser window */
  background-color: var(--accent-color-dark);
  color: var(--accent-text-color);
}

#header-image {
  background-image: url('../images/header.jpg');
  /* background-size: cover; */
  height: 230px;
  width: 100%;
}

#site-navigation {
  background-color: var(--accent-color-dark);
  color: var(--accent-text-color);
  display: flex;
  justify-content: center;
}

#site-navigation ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
  display: flex;
  justify-content: center;
  flex-grow: 1;
  max-width: var(--maximum-page-width);
}

#site-navigation ul li {
  text-align: center;
  font-size: 21px;
  font-weight: var(--medium);
  flex-grow: 1;
  padding: 10px;
}

@media only screen and (max-width: 1023px) {
  #site-navigation ul li {
    min-width: inherit;
    font-size: 36px;
  }
}

#announcement {
  background-color: var(--accent-color);
  color: var(--accent-text-color);
  display: flex;
  justify-content: center;
  padding: 10px;
}

#announcement .announcement-text {
  font-size: 36px;
  font-weight: var(--medium);
}