table {
    border-collapse: collapse;
}
table.center {
    margin-left: auto;
    margin-right:auto;
}
nav td {
    background-color: blue;
    width: 100px;
    height: 40px;
    font-size: 24px;
    color: yellow;
    text-allignL center;
    border: 1px solid black;
    border-radius: 15 px;
}
nav tr{
    margin: 30px auto;
}
tr a {
   color: yellow;
   text-decoration: none;
}
ul.navi {
    margin-left: 30px;
}
li.navi{
    width: 100px;
    height: 40 px;
    background-color: red;
    first-style-tyle


}