.black-ribbon {
  position: fixed;
  z-index: 9999;
  width: 70px;
}
@media only all and (min-width: 768px) {
  .black-ribbon {
    width: auto;
  }
}
.stick-left {
  left: 0;
}
.stick-right {
  right: 0;
}
.stick-top {
  top: 0;
}
.stick-bottom {
  bottom: 0;
}

/*body {
  -webkit-filter: grayscale(80%); /* สำหรับ Chrome, Safari, Opera */
/*  filter: grayscale(80%);
}*/