Frontend HTML code for The Watchers

<h3>Work Watch</h3>
<h4>Time Length &emsp; Customize Timer Look &emsp; Time Breaks </h4>
<h2><time>00:00:00</time></h2>
<button id="start">START</button>
<button id="stop">STOP</button>
<button id="clear">RESET</button>

body {
    color: #FFFFFF;
    background: #000000;
    text-align: center;
    font-family: 'OCR A Std', monospace;
  }
  
  #start {
    margin: 40px auto;
    text-align: center;
    color: #DAD6D6;
    background: #008000;
    border:solid px #35492C;
    border-radius:5px;
    padding:16px 40px 16px;
    letter-spacing: 2px;
    cursor:pointer;
  }
  
  #stop {
    margin: 40px 5px auto;
    text-align: center;
    color: #DAD6D6;
    background: #B22222;
    border:solid 2px #590F20;
    border-radius:5px;
    padding:16px 40px 16px;
    letter-spacing: 2px;
    cursor:pointer;
  }
  
  #clear {
    margin: 40px auto;
    text-align: center;
    color: #00000;
    background: #F0FFFF;
    border:solid 2px #3E383F;
    border-radius:5px;
    padding:16px 50px 17px;
    letter-spacing: 2px;
    cursor:pointer;
  }
  
  h2
  {
    font-size: 50px;
    letter-spacing: 2px;
    margin: 150px 0 0 ;
  }
  
  h3
  {
    font-size: 40px;
    letter-spacing: 5px; 
    margin: 30px
    background: #FFFFFF;
    border:solid 5px #3E383F;
    border-radius:5px;
    padding:16px 40px 16px;
    letter-spacing: 2px;
    cursor:pointer;
      
  }
  
  h4
  {
    font-size: 15px;
    letter-spacing: 1px;
    margin: 1px
    background: #000000;
    border:solid 2px #3E383F;
    border-radius: 10px;
    padding:1px 1px 1px;
    letter-spacing: 2px;
    cursor:pointer;
    text-align: center;
    
  }