.panel {
  margin-bottom: 10px;
}
body{
background: #eee url("https://trungtamytesonha.vn/uploads/bgtrongdong_1.png");
    background-position-x: 0%;
    background-position-y: 0%;
    background-size: auto;
  background-position-x: center;
  background-position-y: -35%;
  background-blend-mode: soft-light;
  background-size: cover;
}
.fix_banner_left {
  margin-left: -6%;
}
.fix_banner_right {
  margin-right: -6%;
}