Check out example codes for "overflow css". It will help you in understanding the concepts better.

Code Example 1

.auto {
  overflow: auto; /* Will show scroll bar if needed */
}
.scroll {
  overflow: scroll; /* Will show scroll bar */
}
.hidden {
  overflow: hidden; /* Won't show content outside */
}

Code Example 2

div.ex1 {
  overflow: scroll;
}

div.ex2 {
  overflow: hidden;
}

div.ex3 {
  overflow: auto;
}

div.ex4 {
  overflow: visible;
}

Code Example 3

/* To solver overflow issue in IE,
always use properties separately,
do not use short hand */

div {
  overflow-x: hidden;
  overflow-y: auto;
}

Code Example 4

div {
  width: 200px;
  height: 
50px;
  background-color: #eee;
  
overflow: visible;
}

Code Example 5

div{
	overflow : scroll;
}

Learn ReactJs, React Native from akashmittal.com