body {
    font-family: Verdana;
   text-align:center;
    background-image: url("https://images.rawpixel.com/image_800/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvdjEwNzQtMDA4LWt2a2QwaXh0LmpwZw.jpg");



}
div.exa{
            background-color: cadetblue;
            padding: 15px 25px;
            border-color: white;
            border-width: thick; /* thin medium */
           font-family: papyrus;
        }
div.header{
   text-shadow: cadetblue 3px 3px;
   background-color: gray;
   padding: 10px 10px;
}

table, th, td {
    border: 3px solid black;
    border-collapse: collapse;
    padding: 5px;
    text-align: centre;
    margin: 5% 10%;
    background-color: gray;
}
   
        table{
            box-shadow: cadetblue 10px 10px;
        }


        .button {
            color: gray;
            font-size: 4em; /* 1em = standard size*/
            background-color: cadetblue;
            padding: 15px 30px;
            border-radius: 30px;            
        }