body {
 font-family: "Helvetica Neue", helvetica, arial, sans-serif;
 background-color: black;
 color: #fff;
}

h1 {
  text-align: center;
  font-size: 5vw;

}

.clock {
    font-size: 25vw;
    text-align: center;
    border-style: solid;
    border-width: 1%;
    border-radius: 2%;
    background-color: fff;
}