body {
  margin: 0;
  padding: 40px;
  background: #ffff33;
  font-family: Consolas, 'Courier New', monospace;
  color: #000;
}

h1 {
  font-size: 36px !important;
  margin-bottom: 10px;
}

p {
  font-size: 24px !important;
  margin-bottom: 20px;
}

input[type="file"] {
  display: block;
  margin-bottom: 15px;
  font-size: 16px;
}

input[type="submit"] {
  display: inline-block;
  background: #333;
  color: #fff;
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}

input[type="submit"]:hover {
  background: #555;
}

/* Small tweak for mobile */
@media (max-width: 600px) {
  body {
    padding: 20px;
  }
h1 {
  font-size: 36px !important;
  margin-bottom: 10px;
}
p {
  font-size: 24px !important;
  margin-bottom: 20px;
}

  input[type="submit"] { font-size: 18px; padding: 10px 20px; }
}
.upload-submit {
  display: inline-block;
  background: #333;
  color: #fff;
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  user-select: none;
}

.upload-submit:hover {
  background: #555;
}