* {
  box-sizing: border-box;
  margin: 0;
  font-family: Roboto;
}

*:focus { outline: 0 }

html, body {
  width: 100%;
  height: 100%;
}

.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}