.center {
  margin: auto;
  width: 50%;
  border: 3px solid green;
  padding: 10px;
}

.center {
  text-align: center;
  border: 3px solid green;
}

img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 40%;
}

body {
  background-color: powderblue;
}
h1 {
  color: blue;
  text-align: center;
}
p {
  color: black;
  text-align: center;
}