table {
  border-collapse: collapse;

  width: 100%; 
} 
td {
    width:10%;
}
td,tr {
border: 1px solid #dddddd;
    text-align: center;
    padding: 8px;
}
th {
    background-color: #21a7f9;
    text-align: center;
    padding: 8px;
    font-size: 20px;
    color : white;
}

tr:nth-child(even) {
   
}