body {
  margin: 5vh 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-family: system, sans-serif;
}

h1 {
  margin: 0;
  padding: 0;
}
p {
  margin: 0.5rem 0; /* 8px 0 */
}

.instructions,
canvas {
  margin: 2rem 0 0.5rem; /* 32px 0 8px */
}
.small {
  color: #444;
  font-size: 0.75rem; /* 12px */
  margin: 0.5rem 0; /* 8px 0 */
}
input[type="file"] {
  width: 100%;
  max-width: 32rem; /* 512px */
  box-sizing: border-box;
  font-size: 1.125rem; /* 18px */
  background: lightgray;
  border-radius: 0.5rem; /* 8px */
  padding: 0.25rem; /* 4px */
}
canvas {
  max-width: min(32rem, 100%); /* 512px */
  /* Fallback background color */
  background-color: #aaa;
  /* Checkerboard pattern with a size of 5x5% repeating = 20x20 repeats */
  background: repeating-conic-gradient(#999 0deg 90deg, #bbb 90deg 180deg) center / 5% 5%;
  border-radius: 0.5rem; /* 8px */
}

a.button {
  display: inline-block;
  background: #ed1c24;
  border: 1px solid black;
  border-radius: 0.25rem; /* 4px */
  color: #ed1c24;
  cursor: pointer;
  font-weight: bold;
  margin: 0.25rem 1rem;  /* 4px 16px */
  padding: 0.25rem 1rem; /* 4px 16px */
  text-align: center;
  text-decoration: none;
}
a.button:hover,
a.button:focus,
a.button.active {
  text-decoration: underline;
}

#frame-list {
  width: 100%;
  max-width: 50rem; /* 800px */
}
/* The frame-sublist structure in HTML provides control over line-breaking in flexbox */
.frame-sublist {
  flex: auto;
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
}

#frame-list a.button {
  flex: auto;
}
a.button.black {
  color: black;
}
a.button.white,
a.button.trans {
  color: white;
}
a.button.trans {
  background: linear-gradient(to bottom, #5bcffa 0%, #5bcffa 49%, #f5abb9 51%, #f5abb9 100%);
}
a.button.pride {
  background: black;
}
.rainbow-text {
  background: linear-gradient(to right, red 0%, #ff0 17%, lime 33%, cyan 50%, #f0f 83%, red 100%);
  background-clip: text;
  -webkit-background-clip: text; /* necessary for Chrome */
  -webkit-text-fill-color: transparent;  /* works with Firefox too! */
}

#export-link {
  background: #f6f2ec;
  border: 1px solid #888;
}