.mytable {
    border: 1px solid #000;
    border-radius: 8px;
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
}

.mytable td,
.mytable th {
    border: 1px solid #000;
    padding: 20px;
}

.mytable th {
    background-color: #f5f5f5;
}