WriteFreely table css

I just added this to the custom stylesheet of my blog (/me/c/<blogname>):

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

th, td {
    padding: 5px;
}

th {
    border-bottom: 1px solid #f2f2f2;
}

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