body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
}

h1,h2,h3,h4,h5,p {
    padding: 0;
    margin: 0;
}

.fcai_card {
    padding: 20px;
    border-radius: 20px;
    margin: 20px;
    background: #ffffff;
    text-align: center;
}

.fcai_card img {
    width: 300px;
    background: steelblue;
    border-radius: 20px;
    margin: 10px 0px;
}

canvas {
    position: absolute;
}

video {
    display: none;
    width: 720px;
    height: 560px;
    border-radius: 20px;
}

#switchButton {
    width: 64px;
    height: 50px;
    padding-top: 14px;
    border-radius: 50%;
    background: #069A35;
    text-align: center;
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
    text-align: center;
    cursor: pointer;
}

#switchButton img {
    width: 36px;
    height: 36px;
}

button {
    width: 100%;
    border: none;
    border-radius: 20px;
    padding: 10px;
    font-size: 20px;
    background: #000000;
    color: #ffffff;
    cursor: pointer;
}

button:hover {
    background: #222222;
}

@media only screen and (max-width: 600px) {
    body {
        margin: 0;
        padding: 0;
        width: 100%;
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
        background: #000;
    }
    .fcai_card img {
        width: 100%;
        background: steelblue;
        border-radius: 20px;
        margin: 10px 0px;
    }
    video {
        display: none;
        width: 100%;
        height: 100%;
        border-radius: 20px;
    }
    canvas {
        position: absolute;
        width: 100%;
        height: 560px;
    }
}