.carousel-item{
  border:none !important;
}
.carousel-item:nth-child(3n+1){
background:
linear-gradient(63deg, #555 23%, transparent 23%) 7px 0,
linear-gradient(63deg, transparent 74%, #555 78%),
linear-gradient(63deg, transparent 34%, #555 38%, #555 58%, transparent 62%),
#444 !important;
background-size: 16px 48px !important;
}
.carousel-item:nth-child(3n+2){
background:
radial-gradient(circle at 100% 50%, transparent 20%, rgba(255,255,255,.1) 21%, rgba(255,255,255,.1) 34%, transparent 35%, transparent),
radial-gradient(circle at 0% 50%, transparent 20%, rgba(255,255,255,.1) 21%, rgba(255,255,255,.1) 34%, transparent 35%, transparent) 0 -50px  !important;
background-color: #444 !important;
background-size:25px 33px !important;
}
.carousel-item:nth-child(3n+3){
background:
linear-gradient(324deg, #555 4%,   transparent 4%) -70px 43px,
linear-gradient( 36deg, #555 4%,   transparent 4%) 30px 43px,
linear-gradient( 72deg, #444 8.5%, transparent 8.5%) 30px 43px,
linear-gradient(288deg, #444 8.5%, transparent 8.5%) -70px 43px,
linear-gradient(216deg, #444 7.5%, transparent 7.5%) -70px 23px,
linear-gradient(144deg, #444 7.5%, transparent 7.5%) 30px 23px,

linear-gradient(324deg, #555 4%,   transparent 4%) -20px 93px,
linear-gradient( 36deg, #555 4%,   transparent 4%) 80px 93px,
linear-gradient( 72deg, #444 8.5%, transparent 8.5%) 80px 93px,
linear-gradient(288deg, #444 8.5%, transparent 8.5%) -20px 93px,
linear-gradient(216deg, #444 7.5%, transparent 7.5%) -20px 73px,
linear-gradient(144deg, #444 7.5%, transparent 7.5%) 80px 73px !important;
background-color: #555 !important;
background-size: 5100px 100px !important;
}