body {
  text-align: center;
  background: #53f;
  color: white;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 10px;
}

.masthead {
  text-align: center;
  margin: 5em 0 0;
}

h1 {
  text-align: center;
  font-size: 4em;
  margin: 0;
  line-height: 3em;
  color: #fff
}

.colophon {
  align-items: center;
  justify-content: center;
  text-align: center;
  margin: 4rem 0;
}

.colophon p {
  font-size: 1.6em;
  color: rgba(0, 0, 0, 0.6);
}

.colophon a {
  align-self: flex-end;
  color: #212121;
  background: #ffc600;
  transition: all .2s ease;
}

.colophon a:hover {
  background: #fff;
}

.controls {
  margin-bottom: 50px;
  font-size: 2em;

}

input {
  width: 100px;
}

:root {
  --base: #ffc600;
  --spacing: 10px;
  --blur: 10px;
}

img {
  padding: var(--spacing);
  background: var(--base);
  filter: blur(var(--blur));
}

.hl {
  color: var(--base);
}