@media (max-width: 1140px) { 
    #menu {
        position: static;
    }

    li {
        margin-left: 8px;
        margin-right: 23px;
    }

    #header {
        width: 80%;
        margin: 5em auto;
    }

    body {
        width: 100%;
    }
 }

 @media (max-width: 539px) { 
    video {
        width: 100%;
        height: none;
    }
 }


 @media (max-width: 577px) {
    .thumbnail-container {
        width: 100%;
    }
 }
 

 @media (max-width: 630px) { 
    #email-link {
    font-size: 2.6em;
    }
 }