html, body { font-family: 'Roboto', sans-serif;
    height: 100%;
}

html { font-family: 'Roboto', sans-serif;
    display: table;
    margin: auto;
}

body { font-family: 'Roboto', sans-serif;
    display: table-cell;
    vertical-align: middle;
}

h1 { font-family: 'Roboto', sans-serif;
    text-align: center;
}
p { font-family: 'Roboto', sans-serif;
    text-align: center;
}
.button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 12px 22px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}