body {
  background: linear-gradient(0deg,rgba(30, 136, 229, 0.3), rgba(30, 136, 229, 1));
  background-attachment: fixed;
  background-size: auto 100vh;
}
.conpanel{width:70%; min-height: 80vh}
.conpanel img{max-width:40%; margin:2.5em auto}