chant.css

:enabled {
  border-radius: 50%;
}

:focus-within {
  filter: hue-rotate(-3deg);
}

:focus {
  border-radius: 50% 50% 0 50%;
  box-shadow: 0 0 0 1ch;
  outline: thick dotted;
}

* { box-sizing: border-box }
header * { font: unset }
h1 { font: 1.618em sans-serif; margin: 0; float: left }
h2 { font: 1.382em sans-serif; margin: 0 }

html {
  color: #313;
  background: #ed3;
  font-family: sans-serif;
  font-size: max(3ch, 3vh + 1vmin);
}

header {
  align-self: center;
  border-radius: 0% 0% 50% 50%;
  display: flow-root;
  margin-bottom: 2em;
  padding: 1em;
}

body {
  margin: 0;
  overflow-wrap: anywhere;
}

main {
  align-items: center;
  display: flex;
  flex-flow: column;
  margin: auto;
}

.wrap { flex-wrap: wrap }
.warp { flex-wrap: wrap-reverse }
.flix { display: inline-flex }
.flex { display: flex }
[hidden] { display: none }