:root {
  color-scheme: light dark;

  --bg:           light-dark(#fffff0, darkslategray);
  --txt-color:    light-dark(black, white);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #fffff0;
  --txt-color: black;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: darkslategray;
  --txt-color: white;
}

html {
    background-color: var(--bg);
    color: var(--txt-color);
}

* { background-color: var(--bg) }

.container div { background-color: var(--bg) }

body {
  font-family: "Helvetica Neue";
}

header {
  font-family: "Helvetica Neue";
  display: flex;
  justify-content: right;
  align-items: right;
}

a {
  color: red;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.container {
  display: grid;
  grid-template-areas:
    "header header"
    "menu content"
    "footer footer";
  grid-template-columns: 1fr 3fr;
  gap: 3px;
  background-color: darkred;
  padding: 5px;
  border-radius: 25px;
}
.container div {
  padding: 10px;
  border-radius: 25px;
}
.container div.header {
  grid-area: header;
  text-align: center;
}
.container div.menu {
  grid-area: menu;
}
.container div.content {
  grid-area: content;
}
.container div.footer {
  grid-area: footer;
  text-align: center;
}

.flex-title {
  border: 1px solid darkred;
  border-radius: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-left: 20vw;
  margin-right: 20vw;
}
.flex-row {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  width: 100%;
}
.flex-column {
  display: flex;
  flex-direction: column;
  flex-basis: 100%;
  flex: 1;
  margin-left: 10vw;
  margin-right: 10vw;
}

.change-bg-colour {
  float: right
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
}
.skip-link:focus {
  left: 0;
  padding: 0.75rem 1rem;
  background: var(--bg);
  color: var(--txt-color);
  z-index: 1000;
}