body{
  margin:0;
  padding:0;
}
.m{
  margin:10px;
}
.m-t{
  margin-top: 10px;
}
.m-b{
  margin-bottom: 10px;
}
.m-l{
  margin-left: 10px;
}
.m-r{
  margin-right:10px;
}
.m-tb{
  margin: 10px 0;
}
.m-lr{
  margin: 0 10px;
}

.carousel-bg1{
  background-image: url("../imgs/res.jpg");
}
.carousel-bg2{
  background-image: url("../imgs/res2.png");
}
.carousel-bg3{
  background-image: url("../imgs/res3.png");
}