body {
    font-family: sans-serif;
    margin-left:50px;
}

.back{
    background-color: black; 
    color: white;
} /* Gray */

table,td,th{
    text-align:left;
}
table{
    border: 1px solid #ddd;
    position: absolute;
    border-collapse: collapse;
    left:35%;
    top:5%;
}

td,th{
   padding:10px;
}


tr:nth-child(even) {
    background-color: #f2f2f2; 
}