var slide = document.querySelector('.slide');
var slide2 = document.querySelector('.slide2');
var aspectRatio = 720/540; // proporção de aspecto do div .slide
function resize() {
// verifica as funcoes
var newHeight = document.documentElement.offsetHeight-39; // espaço ocupado pelo footer
var newWidth = 0.8 * (document.documentElement.offsetWidth); // largura disponível: 80% do documento
newHeight/=2; // divide a altura pelo número de slides
var newWidthToHeight = newWidth / newHeight;
// ajusta o div mantendo as proporções de aspecto definidas por aspectRatio
if (newWidthToHeight > aspectRatio) {
newWidth = newHeight * aspectRatio;
} else {
newHeight = newWidth / aspectRatio;
}
slide.style.width = newWidth + 'px';
slide.style.height = newHeight + 'px';
// redimensione cada um dos slides
slide2.style.width = newWidth + 'px';
slide2.style.height = newHeight + 'px';
}
// efetua um redimensionamento inicial
resize();
// redimensiona o slide sempre que a janela for redimensionada
window.addEventListener('resize', resize, false);
// (!) utilize a função resize sempre que o div .slide sofrer alterações
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