* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body{
    background-color: #000;
    
  }
  .mainDiv {
    width: 100%;
    height: 100vh;
    position: relative;
  }
  
  .centerDiv {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
  }
  
  h1 {
    text-transform: capitalize;
    color:aqua;
    text-align: center;
    font-size: 25px;
    margin-bottom: 30px;
    font-size: 2.1rem;
  }
  
  h2 {
    text-align: center;
    margin-bottom: 25px;
    color:bisque;
    user-select: none;
 
  }
  
  textarea {
    height: 300px;
    background: rgb(190, 229, 247);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    border: 5px solid #34495e;
    padding: 10px;
    font-size: 1.3rem;
    margin-bottom: 18px;
    outline: none;
    font-family: 'Roboto Mono', monospace;
  }
  
  .mainBtn {
    border-radius: 7px;
    padding: 10px 20px;
    font-size: 1rem;
    background: #ecf0f1;
    border: 3px solid #2980b9;
    cursor: pointer;
    --hover:#2980b9;
  }
  
  .mainBtn:hover,
.mainBtn:focus {
  -webkit-animation: pulse 1s;
          animation: pulse 1s;
  -webkit-box-shadow: 0 0 0 2.5em rgba(255, 255, 255, 0);
          box-shadow: 0 0 0 2.5em rgba(255, 255, 255, 0);
}

@-webkit-keyframes pulse {
  0% {
    -webkit-box-shadow: 0 0 0 0 var(--hover);
            box-shadow: 0 0 0 0 var(--hover);
  }
}

@keyframes pulse {
  0% {
    -webkit-box-shadow: 0 0 0 0 var(--hover);
            box-shadow: 0 0 0 0 var(--hover);
  }
}