total widht of scren css code example

Example 1: get screen width javascript

window.screen.width
//or just
screen.width

Example 2: 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%;
}