set bottom margin in latex code example

Example 1: adding tr margin bottom

tr{
    display: flex;
    margin-bottom: 10px;
}
th{
	width: 100%;
}

Example 2: latex page margin

\usepackage{geometry}
 \geometry{
 a4paper,
 total={170mm,257mm},
 left=20mm,
 top=20mm,
 }