.machine-back {
  position: relative;
  margin: 50px auto;
  max-width: var(--machine-width);
  box-shadow: inset 0 0 30px #000000, inset 0px -4px 0px #2b2b2b,
    inset 1px -2px 0px 2px white, 0px 0px 1px 5px #000000;
  background: var(--machine-background);
  padding: 40px;
  flex: 1 0 auto;
  border-top-left-radius: 3px;
  border-top-right-radius: 3px;
  border-bottom-left-radius: 1px;
  border-bottom-right-radius: 1px;
  user-select: none;
  transition: transform 0.25s ease-in-out;
}

@media (max-width: 1030px) {
  .machine-back {
    --machine-width: 90%;
    --content-width: 90%;
    padding: 20px 0;
    margin: 100px auto 50px;
  }
}

.machine-back::after,
.machine-back::before {
  content: '';
  position: absolute;
  width: calc(100% - 50px);
  height: 10px;
  background: #2b2b2b;
  bottom: -14px;
}

.machine-back::after {
  transform: skewX(50deg);
  left: 2px;
  border-top-left-radius: 3px;
  border-bottom-left-radius: 5px;
}

.machine-back::before {
  transform: skewX(-50deg);
  left: auto;
  right: 2px;
  border-top-right-radius: 3px;
  border-bottom-right-radius: 5px;
}