/* -----------------------
  howto
----------------------- */
.howto{
  position: relative;
  background: url(../img/howto_bg.png) no-repeat top center/ 100%;
}

.howto .howto-line{
  position: absolute;
  left: min(calc(226 / 750 * 100vw), 226px);
  bottom: max(calc(-120 / 750 * 100vw), -120px);
  height: min(calc(886 / 750 * 100vw), 886px);
  width:  min(calc( 16 / 750 * 100vw),  16px);
  --reveal: 1%;
  clip-path: inset(0 0 calc(100% - var(--reveal)) 0);
  -webkit-clip-path: inset(0 0 calc(100% - var(--reveal)) 0);
  will-change: clip-path;
  z-index: 3;
}