@media only screen and (max-width: 768px) {
  body {
    font-size: 16px;
    padding: 0;
    margin: 0;
  }
  header img {
    height: auto;
    width: 250px;
  }
  nav ul {
    display: block;
    text-align: center;
  }
  nav ul li {
    display: block;
    margin: 5px 0;
  }
}
.button {
  background-color: #7B9FC9;
  border: 2px solid #7B9FC9;
  width: 50 px;
  color: white;
  border-radius: 4px;
  padding: 8px 18px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 12px;
  margin: 0px 1px;
  cursor: pointer;
  box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}
.button:hover {
  background-color: white; 
  color: black; 
  border: 2px solid #7B9FC9;
}