.header-bg{
    background-image: url("../images/header/header-line.avif");
    background-position: bottom center;
    background-repeat: no-repeat;
    background-size: 100vw;


  position: relative;
  z-index: 9999;
  width: 100%;
}


.header-bg.is-fixed{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9999;
  box-shadow: 0 2px 10px rgba(0,0,0,.15);
}