@media screen and (min-width: 1026px) {
    .c6007__item-list {
        max-height: 600px;
        overflow-y: auto;
    }
}

.c6007__item .video-thumbnail-wrapper:after {
    content: "";
    display: block;
    height: 100%;
    width: 0.188rem;
    position: absolute;
    top: 0;
    left: 0;
    
}

.c6007__item + .c6007__item:nth-child(3n-1) .video-thumbnail-wrapper:after {
    background-color: #8ad74a;
}
.c6007__item + .c6007__item:nth-child(3n) .video-thumbnail-wrapper:after {
    background-color: #ffcc5b;
}
.c6007__item + .c6007__item:nth-child(3n+1) .video-thumbnail-wrapper:after {
    background-color: #0392cf;
}