.table-a {
            border:0px solid black;
            width:100%;
            body:text-align:center;
            margin-left:0%;
            margin-right:0%;
        }

.table-b {
            border:0px solid black;
            width:90%;
            body:text-align:center;
            background-color:#FFFFFF;
            margin-left:5%;
            margin-right:5%;
        }

.table-c {
            border:0px solid black;
            width:90%;
            body:text-align:center;
            margin-left:5%;
            margin-right:5%;
            background-color: #000000;
        }
        .table-c td {
        border: 0px;
        body:text-align:center;
        padding: 10px;
        }

.table-d {
            border:0px solid black;
            width:90%;
            body:text-align:center;
            margin-left:5%;
            margin-right:5%;
            background-color: light yellow;
        }

body {
    background-color: lightyellow;
}

*
{
font-family: arial;
}

p {
    font-size: 12px;
}

p.thicker {
    font-weight: 550;
}

p.ex1 {
    padding-left: 20px;
    padding-right: 20px;
    padding-bottom: 0px;
    padding-top: 0px;
}

td.myclass { background-color : #000000; }

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.tops {
    vertical-align: top;
}

div.a {
    text-align: center;
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 80%;
}

.navbar {
    overflow: hidden;
    background-color: #ffbf00;
    font-family: Arial, Helvetica, sans-serif;
}

.navbar a {
    float: left;
    font-size: 14px;
    color: black;
    text-align: center;
    padding: 14px 12px;
    text-decoration: none;
}

.dropdown {
    float: left;
    overflow: hidden;
}

.dropdown .dropbtn {
    font-size: 14px;    
    border: none;
    outline: none;
    color: black;
    padding: 8px 10px;
    background-color: inherit;
    font-family: inherit;
    margin: 0;
}

.navbar a:hover, .dropdown:hover .dropbtn {
    background-color: red;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    float: none;
    color: black;
    padding: 4px 12px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {
    background-color: #ddd;
}

.dropdown:hover .dropdown-content {
    display: block;
}