article {
  background-color: unset;
  box-sizing: border-box;
  padding: 0;
}
.content_wrap {
  background-color: white;
  padding: 0 20px;
}
#kv {
  display: flex;
  /* height: 100vh; */
  width: 100vw;
  justify-content: center;
  align-items: center;
  margin-left: calc((100vw - 100%) / 2 * -1);
}
#kv img.pc {
  /* max-width: 80%; */
}
@media (min-width: 641px) {
  article {
    max-width: 800px;
  }
  #kv {
    min-height: 100vh;
  }
}
@media (max-width: 640px) {
  #kv {
    min-height: 100vh;
    width: 100vw;
    margin-left: auto;
    margin-right: auto;
  }
}