Answers for "div width height"

how do i make a div full width with css

.row-full{
 width: 100vw;
 position: relative;
 margin-left: -50vw;
 height: 100px;
 margin-top: 100px;
 left: 50%;
}

how to get the height of a div in css

var clientHeight = document.getElementById('exampleElement').clientHeight;
alert(clientHeight);

var offsetHeight = document.getElementById('exampleElement').offsetHeight;
alert(offsetHeight)