#container {
    max-width: 600px;
    margin: 0 auto;
}

#button-row {
    max-width: 600px;
    margin: 0 auto;
    text-align: right;
    font-size: 0;
}
#button-row button {
    background: #eee;
    transition: background 150ms;
    border: 1px solid #999;
    display: inline-block;
    font-size: 12pt;
    line-height: 16pt;
    margin-left: -1px;
    color: #555;
}
#button-row button:first-child {
    border-top-left-radius: 0.3em;
    border-bottom-left-radius: 0.3em;
}
#button-row button:last-child {
    border-top-right-radius: 0.3em;
    border-bottom-right-radius: 0.3em;
}
#button-row button:focus, #button-row button:hover {
    background: #ccc;
    outline: none;
}