body {
  margin: 0;
  min-height: 100vh;
  background: #f2f2f2;
  color: #111;
  font-family: Arial, sans-serif;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

button,
input,
textarea {
  font: inherit;
  box-sizing: border-box;
}

.is-hidden {
  display: none !important;
}

.is-open {
  display: flex !important;
}