body {
  font-family: 'Trebuchet MS', sans-serif;
}
caption {
  display: table-caption;
  text-align: center;
}
.box {
  background-color: lightblue;
  border: 2px solid navy;
  position: absolute;
  top: 50%;
  left: 50%;
  padding: 10px;
  margin: 20px;
}
.wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;           
  margin: 0;
}