#header_main_table{
    border: 1px solid black; 
    width:1400px; 
    height:100px; 
    margin: 10px auto;
}

#central_main_table{
    border: 1px solid black; 
    width:1400px; 
    height:100px; 
    margin: 10px auto;
}

#central_left_main_column{
    width:200px;
}

#central_right_main_column{
    width:200px;
}