:root {
  --main-dark-color: #191a1b;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

button {
  background: none;
  border: 1px solid var(--main-dark-color);
  border-bottom: 2px solid var(--main-dark-color);

  border-radius: 5px;
  padding: 5px 10px;

  box-shadow: 0px 0px 5px 1px rgba(25, 26, 27, 0.25);

  transition: box-shadow 0.1s, border 0.1s;
}

button.inactive {
  box-shadow: none;
  opacity: 0.5;
}

button:hover {
  cursor: pointer;
}

button:active {
  box-shadow: none;
  border-bottom: 1px solid var(--main-dark-color);
}