body
{
    margin: 0;
    padding: 15px;
    font-family: sans-serif;
    background: white;
}

.inner
{
    text-align: center;
}

.inner a
{
    padding: 18px 58px;
    color: white;
    background: green;
    border-radius: 3px;
    text-decoration: none;
    font-size: 18px;
    display: inline-block;
    font-family: sans-serif;
    box-sizing: border-box;
    margin-top: 50px;
    width: 100%;
    letter-spacing: 1px;
}

@media screen and (min-width: 768px)
{
    .inner a
    {
        padding: 25px 58px;
        font-size: 26px;
        margin-top: 150px;
        width: initial;
    }
}