.root {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    color: #8a0000;
    transition: box-shadow .5s linear;
}
.health-state-1 {
    box-shadow: inset 0 0 200px;
}
.health-state-0 {
    box-shadow: inset 0 0 300px 60px;
}