body {
    background-color: dimgray;
}

.cover {
    background-color: firebrick;
    border-radius: 50%;
}

.here > .cover {
    position: absolute;
    width: 100px;
    height: 100px;
    transform: translateX(-50%) translateY(-50%);
}

.here > .cover:hover {
    opacity: 0;
}

.here > .text {
    background-color: gainsboro;
    position: absolute;
    transform: translateX(-50%) translateY(-50%);
    z-index: 1;
    opacity: 0;
    padding: 50px;
    border-radius: 50%;
}

.here > .text:hover {
    opacity: 1;
}

.here {
    display: inline-block;
    position: relative;
    padding: 30px;
}

#vc {
    position: absolute;
    top: 200px;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 300px;
    cursor: pointer;
}

#video {
    display: none;
    position: absolute;
    top: 200px;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
}

#tag {
    position: absolute;
    top: 600px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    display: none;
}

a {
    color: black;
    text-decoration: none;
}

a:hover {
    color: goldenrod;
}