.responsive{
  max-width:100%;
  max-height:100%;
}

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

parent{
  position: relative;
}

body {
      font-family: 'Roboto', sans-serif;
      font-size: 24px;
    }