flipflop.css

:focus { 
  text-decoration-style: solid;
  outline: thick groove;
  box-shadow: 0 0 1ch 1ch #a5e;
}

html {
  font-family: sans-serif;
  font-size: max(3ch, 3vmax + 2vmin);
  line-height: 1.618;
}

body {
  align-items: flex-start;
  display: flex;
  flex-flow: column;
  margin: 0;
  overflow-wrap: anywhere;
}

article {
  contain: style layout;
  display: flex;
  flex-flow: column;
  margin: auto;
}

article > * {
  align-items: center;
  display: flex;
  justify-content: center;
  flex-flow: column;
  min-height: 100vh;
}

h1, h2 {
  display: flow-root;
  font-weight: unset;
  padding: 3vmin;
}

div {
  display: flex;
  flex-flow: column;
  padding: 1rem;
}

aside {
  padding: 1rem;
  transform: rotate(180deg);
}

a {
  border-radius: 100%;
  display: inline-block;
  padding: 1ch;
}

p {
  margin: 0;
  padding-inline: 1ch;
}

a:hover { text-decoration-style: double }
:any-link { text-decoration-style: dotted }

:focus { 
  text-decoration-style: solid;
  outline: thick dotted;
}