header{
    display: flex;
    justify-content: center;
    background-color: #121212;
    border-bottom: 1px solid black; 
    font-size: 120%;
    font-family: 'Source Sans 3';
}

header a{
    padding: 6px 10px;
    font-weight: 600;
}

.headerlink{
    text-decoration: none;
}

.headerlink-active{
    text-decoration: underline;
}