* {
  margin: 0;
  padding: 0;
  -moz-user-select: none;
  -khtml-user-select: none;
  user-select: none;    
}
    
html, body {
  background-color: #00A0E3;
  font-family:arial;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}
   
.center-image {
  text-align: center;
  vertical-align: middle;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
}

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