Show video across width of page and autoplay video

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Hi - Im using the express theme and wanted to show my video across the width of the page and autoplay on a loop. I tried editing the theme.min.css code using the below but did not seem to work 

.template-index .main-content {margin-top: 0;}
.video-background {padding-top: 0; height: 100%; width: 100%;}
.section-header { margin-bottom: 0;}
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