* {
  box-sizing: border-box;
}
body{
  background-image: url('https://i.postimg.cc/yNNBsM0L/Design-sem-nome-15.png');
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
}
::selection{
  background-color:#2E7D32;
  color: white;
}
.container{
  margin: 0 auto;
  width: 40%;
  border: solid 5px #2E7D32;
  border-radius: 5px;
}
.header{
  text-align: center;
}
h1{
  font-family: "Margarine", sans-serif;
  color: #2E7D32;
}
#content-frame {
    width: 100%; 
    height: auto; 
    min-height: 500px; 
}

@media (max-width: 768px) {
  .container {
    width: 90%;
  }
}

@media (max-width: 480px) {
  .container {
    width: 100%; 
  }
}