video {
    position: fixed;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -100;
    transform: translateX(-50%) translateY(-50%);
    background-size: cover;
    transition: 1s opacity;
}

button {
    background-color:black;
    border:ridge;
    color: blue;
    margin: 5% 0% -4% 80%;
    text-align: left;
    text-decoration:double;
    display:table;
 font-size: 25px;
}