Reports

*   {
    box-sizing: border-box;
}
body {
    background-color: black;
    margin: 5px;
}
header h1{

    position: absolute;
    border: 1px solid black;
    background-color: black;
    padding: 2px;
    left: 50%;
    transform: translate(-50%);
}
header {
    position: fixed;
    font-family: Arial;
    color: white;
    height: 35%;
    width: 98%;
    margin: 10px;
    border: 1px solid white;
    background-color: black;
}
#head   {
    font-size: 5.5em;
    font-weight: bold;
    letter-spacing: 11px;
    text-align: center;
}
.video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-width: 100%;
    min-height: 100%;
    border: 1px solid white;
}

<body>
    <header>
        <h1 id="head">EMINƎM</h1>
            <div class="video">
                <video autoplay>
                    <source src="https://www.youtube.com/watch?v=agUn18o-VRA" type="video/mp4">
                </video>
            </div>
    </header>
</body>

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