#center_wrapper_div 
    {
    display: flex;
    justify-content: center;
    align-items: center;
    }            

#content_div 
    {
    border: 2px solid #0d6efd;
    padding: 20px;
    }

#login_table td
    {
    padding: 8px 15px;
    }
    
.EmphasisBoxDiv
    {
    border: 1px solid red;
    padding: 20px;
    max-width: 400px;
    }