ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333333;
    font-size:large;
    font-family: 'Segoe UI';
}

li {
    float: left;
}

li a {
    display: block;
    color: white;
    text-align: center;
    padding: 16px;
    text-decoration: none;
}

li a:hover {
    background-color: #111111;
}
table, th, td {
    border: 1px solid black;
    border-collapse: collapse;
}
table {
    margin: auto;
}
#myHeader {
    background-color:orangered ;
    color: white;
    padding: 20px;
    text-align: center;
    border-radius:10px;
    font-family: 'Segoe UI';
}
body {background-color:gainsboro;}
th, td {
    padding: 15px;
    font-family:'Segoe UI'; 
}
table {
    font-family: arial, sans-serif;
    border-collapse: collapse;
    width: 100%;
}
th {
    text-align: center;
}
table tr:nth-child(even) {
    background-color: #ffe;
}
table tr:nth-child(odd) {
   background-color: white;
}
table th {
    background-color: deepskyblue;
    color: white;
}