/* -----------------------
  expert
----------------------- */
.expert{
  background: url(../img/expert_bg.png) no-repeat top center/ 100%;
}
.expert_sub{
  position: relative;
  z-index: 3;
}
.expert h2 > img{
  position: absolute;
  top: 0;
}
.expert .box{
  position: relative;
  z-index: 2;
}
.expert_e{
  position: absolute;
  width: min(calc(587/ 750 * 100vw),587px);
  top: max(calc(-60/ 750 * 100vw),-60px);
  left: 52.5%;
  transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  animation: rotateExpert 20s linear infinite;
  z-index: -1;
}

@keyframes rotateExpert {
  from { transform: translateX(-52.5%) rotate(0deg); }
  to   { transform: translateX(-52.5%) rotate(360deg); }
}