style.css

*
{
  margin: 0;
   padding: 0;
   box-sizing: border-box;
   font-family: Arial, Helvetica, sans-ser
}

  .body,html{
      background: #01082c;
        height: 10em;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: auto;
  }

  #clock h2
  {
   position: relative;
   display: block;
   color: #ffff;
   text-align: center;
   margin: 10px 0;
   font-weight: 700;
   text-transform: uppercase;
   letter-spacing: 0,4em;
   font-size: 0.8em;

  }

  #clock #time{
    display: flex;
    position: 0,5em;



  }

   #clock #time div span
  {
  position: relative;
  display: block;
  width: 100px;
  height: 80;
  background: #2196f3;
  color: rgb(231, 226, 226);
  font-weight: 300;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3em;
  z-index: 10;
  box-shadow: rgb(17, 16, 16);



  }

   #clock #time  div span:nth-child(2) {
    height: 80px;
    width: 500px;
    font-size: 0.7em;
    letter-spacing: 0.2em;
    font-weight: 500;
    z-index: 9;
    box-shadow: none;
    background:#ffff;
    text-transform: uppercase;
  }


   #clock #time div:last-child span
  {
    background: #e60808;

  }