body {
    font-family: Arial;
}

h1 {
    color: black;
    font-size: 6em;
}
h2 {
    color: black;
    font-size: 3em;
}
h3 {
    color: black;
    font-size: 1,5em;
}
table{
    width: 100%;
}
td, th {
    width: 34%;
    text-align: center;
    border: 4px solid;
    border-color: white;
}
tr:nth-child(odd) {
    background-color: #f5f5f5;
}
tr:nth-child(even) {
    background-color: #fcfcfc;
}