body{
  font-family: helvetica;
}
h1{
  text-align: center;
  margin-top: 50px;
  margin-bottom: 50px;
}
h2{
  text-align: center;
  margin-top: 100px;
  margin-bottom: 50px;
}
img{
  border:1px solid black;
}
.mobile{
  margin: 0 auto;
  display: block;

}