css overflow scroll only when needed code example

Example 1: show scroll only when overflow

overflow: auto;

Example 2: hide scroll bar when not needed

overflow: auto;

Example 3: html overflow scroll only if needed with exemple

p {  
  width: 12em;
  height: 6em;
  border: dotted;
   
  /* le contenu n'est pas rogné */
  overflow: visible;  
}