.video-thumbnail {
    margin: 5% auto;
    width: 300px;
    height: 300px;
    /* border: 4px solid #ffc107; */
    border-radius: 10px;
}

.play-btn {
    background: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 108px;
    animation: animate .9s ease-in-out infinite;
    cursor: pointer;
    width: 100px;
    height: 100px;
    position: relative;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.play-btn i {
    color: #ffc107;
    font-size: 102px;
}

@keyframes animate {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 193, 7, 0.7);
    }

    40% {
        box-shadow: 0 0 0 50px rgba(255, 193, 7, 0);
    }

    80% {
        box-shadow: 0 0 0 50px rgba(255, 193, 7, 0);
    }

    100% {
        box-shadow: 0 0 0 rgba(255, 193, 7, 0);
    }
}