.content-detail {
    background: linear-gradient(to bottom right, #3ad700, #d78100);
}

/* 事例 */
.works_items_area {
    width: calc(1120px + 80px);
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 40px;
    padding-right: 40px;
    padding-top: 40px;
    padding-bottom: 60px;
}

.flex {
    display: flex;
    flex-wrap: wrap;
}
.youtube_wrap {
    overflow: hidden;
    position: relative;
}
.youtube_wrap iframe {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
}
.works_item_client {
    margin-top: 30px;
    font-size: 20px;
}
.works_item_title {
    color: #ffffff;
    margin: 15px 0;
    line-height: 1.3em;
}
.works_item_cats {
    padding-top: 20px;
}
.works_item_cat {
    background: #ffffff;
    border-radius: 3px;
    display: inline-block;
    font-size: 13px;
    margin: 0 10px 10px 0;
    padding: 4px 12px;
}

@media screen and (min-width:769px) {
    .works_item {
        margin-right:2.5%;
        width:31.66%
    }
    .works_item:nth-child(3n) {
        margin-right:0;
    }
    .works_item:nth-child(n+4) {
        margin-top:60px;
    }
}
@media screen and (max-width:768px) {
    .works_item {
        display:block;
    }
    .works_item:nth-child(n+2) {
        margin-top:40px;
    }
}