html {
  --font: 'Martian Mono', monospace;
  --font-title: 'Martian Mono', monospace;
  --font-size: 1.2rem;
  --color: #000;
  --color-light: #ffffff;
  --color-dark: #48525D;
  --radius: 0.2rem;
}

body {
  height: 100vh;
  width: 100%;
  padding: 0;
  margin: 0;
}

body,
input,
textarea,
button {
  font-size: var(--font-size);
  font-family: var(--font);
}

h1,
h2,
h3 {
  font-family: var(--font-title);
}

h1,
h2,
h3,
p,
ul {
  margin: 1rem 0;
}

ul {
  list-style: square;
}

li {
  margin-bottom: 0.5rem;
}

label {
  display: block;
  margin-bottom: 0.25rem;
}

input,
textarea {
  display: block;
  border: 1px solid #ccc;
  width: 100%;
  padding: 0.8rem;
  border-radius: var(--radius);
  background: #eee;
  transition: 0.2s;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color);
  background: white;
  box-shadow: 0 0 0 3px var(--color-light);
}

button {
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background: var(--color-dark);
  color: var(--color-light);
  padding: 0.8rem 1.6rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
  outline: none;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

button:active,
button:focus {
  box-shadow: none;
}

button:hover {
  background: var(--color);
  box-shadow: 0 0 0 3px var(--color), 0 0 0 4px var(--color);
}

button:disabled {
  opacity: 0.2;
  cursor: not-allowed;
  box-shadow: none;
  background-color: none;
}

hr {
  border: 2px solid black;
  margin: 2rem auto;
}