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Use this in Additional CSS customizer section:

.fl-page-links {
    padding: 1em 10%;
    background-color: #eee;
    margin: 0 10em;
}
.fl-page-links a {
    width: 80%;
    font-size: 1.4rem;
    font-weight: bold;
    border-radius: 0;
    background: red;
    color: white;
    text-transform: uppercase;
}

It’s not 100% responsive. It works with most screen widths. Mobile widths still need some adjustment using media queries. It’s a start at least. It’s also not exactly like the sample, but it’s the same idea anyway. You can fiddle with the numeric values if you like. Doing so in your browser’s element inspector tool will let you see immediate results of any change. Changes in the tool do not persist. Copy any changes to Additional CSS for persistence.