*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  background-color: #ffb256;
}
.page{
  display: flex;
  justify-content: center;
  align-items: center;
}
h1{
  margin-bottom: 2rem;
  border-bottom: 5px double black;
}
.container{
  width: 500px;
  /* margin:  auto; */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
  margin-top: 2rem;
 
}
.phone{
  display: flex;
  position: relative;
  flex-direction: column;
  background-color: black;
  border-radius: 30px;
  width: 300px;
  height: 600px;
}
.screen{
  width: 98%;
  height: 80%;
  margin-top: 2rem;
  border: 1px solid grey;
  margin-inline: auto;
  border-radius: 30px 30px 0px 0px;
  background-color: rgb(34, 31, 31);
}
.label{
  color: whitesmoke;
  margin-top:2rem;
  text-align: center;
  font-weight: bold;
}
.number{
  margin-top: 1rem;
  margin-left: 3.5rem;
}
.output{
  color: whitesmoke;
  font-size: 2rem;
  text-align: center;
  margin-top: 5rem;
}

.btns{
  position: absolute;
  bottom: 1rem;
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding-inline: 1rem;
}
button{
  color: whitesmoke;
  background-color: #f333;
  border-radius: 50%;
  height: 60px;
  width: 60px;
}
.example{
  border: 5px double teal;
  margin-right: 5rem;
  
}
h3{
 padding-top: .5rem;
  border-bottom: 1px solid black;
  margin-bottom: 1rem;
  padding: 1rem;
 
}

li{
  margin-top: .5rem;
  text-align: center;
  list-style: none;
  font-weight: bold;
  border-bottom: 1px solid grey;
  padding: .5rem;

  
}

@media screen and (max-width: 600px){
  .page{
    display: flex;
    flex-direction: column-reverse;
    margin: 0 auto;
  }
  .example{
    margin: 0 auto;
  }
}