body{
  background-color: black;
}

* {font: 18px Calibri;}

div, h3 { 
   width: 100%;
  padding: 10px 0;
  border: solid 1px #eee;
  text-align: center;
  color: #eee;
}

h3 {

  border: none;
}

#clock {
    font: bold 54pt sans;
    background: #ddf;
    padding:10px;
    border: solid black 2px;
    border-radius: 10px;
}
span#clock {
  position: absolute;
  top: 45vh;
  left: 40vw;
}