Иван Ерохин

const appHeight = () => {
    const doc = document.documentElement
    doc.style.setProperty('--app-height', `${window.innerHeight}px`)
}
window.addEventListener('resize', appHeight)
appHeight()

:root {
    --app-height: 100%;
}

.block {
    height: 100vh;
    height: var(--app-height);
}