#btn {
  margin-left: 10px;
  width: 100px;
}
.card {
  margin-top: 10px;
  margin-bottom: 30px;
}
#btngrp {
  display: flex;
  justify-content: center;
}
.jumbotron {
  margin-top: 10px;
}
.container {
  margin-top: 10px;
}
.img-fluid {
  width: 100%;
  /* height: 250px; */
}
.btn-lg {
  width: 200px;
  margin: 5px 5px;
}