.video-bg{position: relative;overflow: hidden}.video-bg video{position: absolute;right: 0;top: 0;bottom: 0;left: 0;height: auto;width: auto;max-height: 1000%;max-width: 1000%;min-height: 100%;min-width: 100%;z-index: -9999}.video-bg #particles-js{position: absolute;width: 100%;height: 100%;background-image: url("");background-repeat: no-repeat;background-size: cover;background-position: 50% 50%}