.header {
    width: 100%;
    height: 200px;
    position: relative;
}


.sidebar {
    display: inline-block;
    width: 150;
    padding: 10px;
}

.sidebar > ul {
    padding: 0;  
    text-align: center;
}

.sidebar > ul > li {
    font-family: Arial, Helvetica, sans-serif;
    font-weight: bold;
    list-style: none;
    padding-left: 0;
    font-size: 16px;
    padding: 10px 0 10px 0;
    border-bottom: 1px grey solid;
}

.sidebar li.emphasis{
    font-size: 20px
}