how to define the size of your div in html code example

Example 1: 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! */

Example 2: how to make a workspace container bigger in css

#workspace_container {
        height: 1000px;
		width: 83%;
		min-width: 1060px;
    }

    #workspace {
        padding: 10px;
        /*height: 590px; */ /* (height of activity_area) - (2*padding) - (height of controls) */
        height: 1000px;
    }