body {
 background: radial-gradient(ellipse 60% 900px at center 800px,
  #007870 0%,#002345 100%);
}
a:link {
 color: LightBlue;
}
h1, h2 {
 color: white;
 text-align: center;
}
body > img {
 width: min(50vw,300px);
 display: block;
 margin: 0 auto;
}
.centext {
 display: flex;
 width: 100%;
 justify-content: center;
 color: white;
}
.centext > span {
 width: min(60vw,700px);
}