h1{
    color:green;
    display: block;
  margin-left: auto;
  margin-right: auto;
  width: 30%;
}
.introduction {
    display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
body {
    line-height: 1.7em;
    background: rgb(26,140,180);
background: linear-gradient(166deg, rgba(26,140,180,1) 46%, rgba(8,22,27,1) 100%);
    color:black;
}
article {
    width: 800px;
    margin:auto;
    background-color: aqua;
    
}
footer {
    color: aqua;
}