Set the width of children to fill the parent

Question

I want the children of the div fill its width.

now am using a code like this:

Answer 1

here is the code below , i think this may help for you

	.parent {
  
  display: -webkit-flex; /* Safari */
  display: flex;
  height: 120px;
  background: #000;
  padding: 10px;
  box-sizing: border-box;
}

.child {

  -webkit-flex: 1;  /* Safari 6.1+ */
  -ms-flex: 1;  /* IE 10 */    
  flex: 1;
  margin-left: 1%;
  background: #ffffd;
}