.math{
    font-family: 'Open Sans';
    font-size: 100px;
    color: grey;
    text-align: center;
}

.control-area{
    font-size: 20px;
    text-align: center;
}

.score
{
    font-family: 'Open Sans';
    font-size: 30px;
    color: gray;
}

.answer-area
{
    font-family: 'Open Sans';
    text-align: center;
    font-size: 40px;
    color: grey;
}

.answer-field{
    font-size: 70px;
    border: 0px;
    text-align: center;
    outline: none;
}

/* Hide HTML5 Up and Down arrows. */
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

.center-align{
    text-align: center;
    align-items: center;
}

@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 400;
    src: local('Open Sans'), local('OpenSans'), url('https://themes.googleusercontent.com/static/fonts/opensans/v5/cJZKeOuBrn4kERxqtaUH3T8E0i7KZn-EPnyo3HZu7kw.woff') format('woff');
  }