h1 {
     background-color:lavender; color:black; text-align: center;
   }

h2 {
     background-color:red; color:black; text-align: left;
   }

h3 {
     background-color:yellow; color:black; text-align: center;
   }

table {
    border-collapse: collapse;
    width: 100%;
}

td, th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}

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