body {
  background-image: url(./leaves.jpeg);
}

.container {
  background-color: white;
  display: block;
  border-style: solid;
  border-color: green;
  margin-top: 150px;
  width: 50%;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.btn {
  margin-bottom: 20px;
}