.header{
    background-color: black;
    color: white;
}
.text-center{
    text-align: center;
}
hr{
    height: 5px;
    background-color: black;
}
.bg-grey{
    background-color: gray;
    color: black;
}
hr{
    height: 5px;
    background-color: black;
}
table{
    width: 100%;
}
th,td{
    text-align: center;
}