Vertically centering a div inside another div [duplicate]

Answer 1

enter image description here 100% it works

.div1{
  height: 300px;
  background: red;
  width: 100%;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -ms-flex-align: center;
  -webkit-align-items: center;
  -webkit-box-align: center;
  align-items: center;
}
.div2{
  background: green;
  height: 100px;
  width: 100%;
}

    

      

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https://jsfiddle.net/Mangesh1556/btn1mozd/4/