#mv_outer,
#lv {
    background: transparent;
    z-index: 1;
}
.composite_box01.block_images_15 .inner_item_txt {
    background: #cd5c5c 
}
.composite_box01.block_images_15 .inner_item:nth-of-type(5n-3) .inner_item_txt {
    background: #6495ed
}