* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  list-style: none;
}

html,
body {
  height: 100%;
  min-height: 100vh;
}

body {
  font: 100%/1.5 system, -apple-system, '.SFNSText-Regular', 'San Francisco',
    'Roboto', 'Segoe UI', 'Helvetica Neue', 'Lucida Grande', sans-serif;
  background: #fff;
  color: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.upload-form {
  width: 100%;
}

@media screen and (min-width: 768px) {
  .upload-form {
    width: 700px;
  }
}

.upload-form > div {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.input-wrapper {
  padding: 0.5em 1em;
  background-color: #000;
  color: #fff;
  border-radius: 0.25em;
  position: relative;
  cursor: pointer;
  margin-left: 1em;
}

.input-wrapper:before {
  content: 'Choose code';
}

.input-wrapper input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
}

.code-preview {
  display: none;
  margin-top: 1em;
  white-space: pre-wrap;
  word-break: break-word;
  width: 100%;
  max-height: 400px;
  overflow-y: scroll;
  padding: 1em;
  background-color: #f5f5f5;
  border-radius: 0.35em;
  font: 1rem monospace;
}

.code-preview.visible {
  display: block;
}