@media only screen and (min-width: 480px) {
    .page_youtube_item {
        position: relative;
        display: inline-block;
    }
    .page_youtube_item * {
        -moz-box-sizing: border-box;
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
    }
    .image_thumb {
        z-index: 9;
        text-align: center;
    }
    .play_image {
        background: url('../img/play-black.png') 50% 50% no-repeat;
        opacity: 0.9;
        position: absolute;
        z-index: 10;
        left: 0;
        top: 0;
        background-size: 15%;
        width: 100%;
        height: 100%;
        cursor: pointer;
    }
    .play_image_hover {
        background: url('../img/play-red.png') 50% 50% no-repeat;
        opacity: 1;
        position: absolute;
        z-index: 10;
        left: 0;
        top: 0;
        background-size: 15%;
        width: 100%;
        height: 100%;
        cursor: pointer;
    }
}
@media only screen and (max-width: 479px) {
    .page_youtube_item {
        position: relative;
        display: inline-block;
    }
    .page_youtube_item * {
        -moz-box-sizing: border-box;
        -webkit-box-sizing: border-box;
        box-sizing: border-box;
    }
    .image_thumb {
        z-index: 9;
        text-align: center;
    }
    .play_image {
        background: url('../img/play-black.png') 50% 50% no-repeat;
        opacity: 0.9;
        position: absolute;
        z-index: 10;
        left: 0;
        top: 0;
        background-size: 10%;
        width: 100%;
        height: 100%;
        cursor: pointer;
    }
    .play_image_hover {
        background: url('../img/play-red.png') 50% 50% no-repeat;
        opacity: 1;
        background-size: 10%;
        position: absolute;
        z-index: 10;
        left: 0;
        top: 0;
        background-size: 10%;
        width: 100%;
        height: 100%;
        cursor: pointer;
    }
}