change height of html div code example

Example 1: javascript set div height

document.getElementById("myBtn").style.height = "50px";

Example 2: css size

#myID {
  height: 100px; /* Sets the height */
  width: 200px; /* Sets the width */
}
/* or... */
.myClass {
  height: 220px; /* Sets the height */
  width: 40px; /* Sets the width */
}
/* They both work! */