.mask {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    width: 100%;
    height: 100vh;
    -webkit-transform: translateX(100%);
    transform: translateX(100%);
    background: #35a0d9;
  }
  
  .common-transition {
    position: fixed;
    z-index: 9999;
    top: 0;
    left: 0;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    width: 100%;
    height: 100vh;
    padding: 0;
    margin: 0;
    pointer-events: none;
  }
  
  .common-transition > .item {
    width: 20%;
    background: #35a0d9;
    -webkit-transform: scaleY(0);
    transform: scaleY(0);
  }
  
  .common-transition > .item:nth-child(n+6) {
    display: none;
  }

@media(min-width: 768px){
  .g-header__banner{
    opacity: 0;
    visibility: hidden;
    -webkit-transition: 0.3s;
    transition: 0.3s;
    position: fixed;
    z-index: 100;
  }
  .g-header__banner.is-show {
    opacity: 1;
    visibility: visible;
  }
}