body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
}

.background-color {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #4863A0;
    z-index: -2;
}


.background-video {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.background-video iframe {
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    text-align: left;
    width: 100%;
}

.overlay a {
    text-decoration: none;
}

.overlay img {
    width: 100px;
    margin: 0 10px;
    cursor: pointer;
}

.link-tree {
    position: absolute;
    top: 50px;
    right: 20px;
    font-family: "Courier New", monospace;
    font-size: 20px;
    text-align: right;
    width: 100%;
}

.link-tree a {
    text-decoration: none;
    color: #ffffff;
    margin-left: 10px;
}

.link-tree a:hover {
    text-decoration: underline;
}