.box_container {
width: 100%;
height: 100%;
position: absolute;
top:0;
left:0;
}
.box {
animation: flex 5s infinite;
box-shadow: 0 0 400px 200px rgba(255, 255, 255, .1), inset 0 0 40px 40px rgba(255, 255, 255, .1);;
position: fixed;
top: 0;
left: 0;
transition: .5s;
transition-timing-function: ease-out;
animation-direction: alternate;
}
