body {
   background-image:linear-gradient(to bottom, #7aa, #333);
   background-attachment: fixed;
 }
img {
    display: block;
    margin: 1em auto;
 }
#video-container {
    max-width: 30em;
    padding: 0.5em;
    margin: auto;
 }
video {
    display: block;  
    width: 100%;
    height: auto;
    border: 0.2em solid #000;
    border-top-left-radius: 2em;
    border-top-right-radius: 2em;
    overflow: hiden;
 }