html, body {
    height: 100%;
}

body {
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 80px;
}

#wrapper {
    max-width: 70%;
    margin: 0 auto;
    height: 100%;
}

.btn-primary {
    color: #ffffff;
    font-size: 6em;
    background: #ff5900 !important;
    padding: 10px 20px 10px 20px;
    border-radius: 0;
    text-decoration: none;
    border: none;
}

    .btn-primary:hover, .btn-primary:focus, .btn-primary:active {
        background: #a63700 !important;
    }

#lastPunch {
    text-align: center;
    font-weight: bold;
}

@media (max-width: 768px) {
    #wrapper {
        max-width: 90%;
    }

    .btn-primary {
        font-size: 3em;
    }
}

/*
body {
    height: 100vh;
    margin: 0;
}


#wrapper {
    height: 100%;
    display: flex;
    justify-content: center;
}


#response {
    margin: auto;
    max-width: 70%;
    max-height: 70%;
    display: block;
    border: 1px red solid;
}

button {
    margin: auto;
    max-width: 70%;
    max-height: 70%;
    display: block;
    font-family: Arial;
    color: #ffffff;
    font-size: 50px;
    background: #ff5900;
    padding: 10px 20px 10px 20px;
    text-decoration: none;
    border: none;
    width: 100%;
    height: 100%;
}

    button:hover {
        background: #a63700;
        text-decoration: none;
    }
*/