css <idth size element 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: width css

/*Based on viewport*/
width: 100vh;
width: 100vw;