html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

* {
    box-sizing: border-box;
}

#layoutBody {
    margin: 0;
    font-family: Arial;
    font-size: 17px;
}

#myVideo {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
}

.content {
    position: fixed;
    text-align: center;
    color: #f1f1f1;
    width: 100%;
    bottom: 50px;
    top: 90px;
}

#myBtn {
    width: 200px;
    font-size: 18px;
    padding: 10px;
    border: none;
    background: #000;
    color: #fff;
    cursor: pointer;
}

    #myBtn:hover {
        background: #ddd;
        color: black;
    }