@import url("https://fonts.googleapis.com/css?family=Open+Sans:300,700");
* {
  box-sizing: border-box;
  margin: 0;
  border: 0;
  padding: 0;
}

html, body {
  background-color: #3c373c;
  color: #fff5c8;
  font-family: "Open Sans", sans-serif;
  text-align: center;
}

h1, p { margin: 20px auto; }

a { color: #fff5c8; }

button {
  border: 1px solid #fff5c8;
  border-radius: 10px;
  padding: 20px;
  width: 100px;
  background-color: #3c373c;
  color: #fff5c8;
  font-family: "Open Sans", sans-serif;
  cursor: pointer;
}

button:disabled {
  opacity: 0.2;
  cursor: not-allowed;
}

.main {
  min-height: 100vh;
}

#sample-pad {
  margin: 40px auto;
  max-width: 400px;
}

#sample-pad button {
  margin: 10px;
  user-select: none;
  animation-duration: 0.1s;
}

#info {
  margin: 20px 0;
}

.key {
  display: block;
  font-size: 50px;
}

.overlay {
  position:fixed;
  top: 0;
  left: 0;
  z-index: 10000;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #3c373c;
  font-size: 100px;
  opacity: 0.8;
}

@keyframes animate-button {
  from { background-color: #fff5c8; color: #3c373c; }
  to { background-color: #3c373c; color: #fff5c8; }
}