*, *:before, *:after {
  box-sizing: border-box;
}
html {
  font-size: 62.5%;
}
body {
  color: #444;
  background-color: hsl(0, 0%, 96%);
}
h1 {
  font-size: 1.8rem;
}

.box {
  position: absolute;
  left: 0px;
  right: 0px;
  top: 0px;
  bottom: 0px;
  margin: auto;

  width: 300px;
  height: 29px;

}