.logo {
    max-width: 150px;
}
#video {
    min-height: 600px;
    position: relative;
    background: #f4f4f4;
    padding: 30px 0;
}
#video video {
    height: 640px;
    width: 1000px;
    margin: 0 auto;
    display: block;
    border-radius: 8px;
}
.play-btn {
    background: transparent;
    border: 3px solid #4590FD;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    padding: 0;
    text-align: center;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
.play-btn i {
    font-size: 55px;
    line-height: 10px;
}
@media screen and (max-width: 769px) {
    #video {
        min-height: 300px;
        padding: 0px 0;
    }
    #video video {
        height: 240px;
        width: 320px;
    }
    .play-btn {
        width: 40px;
        height: 40px;
    }
    .play-btn i {
        font-size: 25px;
        line-height: 10px;
    }
}